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  1. #101
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    the alarm plugs directly into the charging connector on this previously mentioned ebay battery.

    Quote Originally Posted by Cat-man-do View Post
    An audible alarm would be sweet provided you can turn it off once it goes off. This alarm seems to be set for low voltage ( 3.3volts ) That means it has to be wired directly to the cells. Not something the novice is going to have an easy time doing. Personally I'd rather deal with blinking warning lights.

  2. #102
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    Quote Originally Posted by patski View Post
    the alarm plugs directly into the charging connector on this previously mentioned ebay battery.
    According to the links you supplied the battery has a balance lead that has a "3" connection plug. The alarm looks to have "4" leads. Is there something I'm missing?

  3. #103
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    Quote Originally Posted by Cat-man-do View Post
    According to the links you supplied the battery has a balance lead that has a "3" connection plug. The alarm looks to have "4" leads. Is there something I'm missing?
    Yep, you're missing that these alarms are designed to be used with 2-3 cell lipo batteries, so one pin is unused if you're only using 2 cell.

  4. #104
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    Quote Originally Posted by DRILLINDK View Post
    I'm a newbie to lights. I don't own one yet, but I'm in the market for one. I'm considering some of the Xeccon lights....any suggestions?
    Anyone with our dental skills and tools should be able to DIY a light as good or better than anything you can buy. (I posted a simple step-by-step on the DIY forum).

  5. #105
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    Quote Originally Posted by Ofroad'bent View Post
    Anyone with our dental skills and tools should be able to DIY a light as good or better than anything you can buy. (I posted a simple step-by-step on the DIY forum).
    Nothing wrong with DIY ( although all of this is off topic ), Not everyone wants to fabricate their own light. A few years back when LED lighting was all new, DIY was the "IN Thing" because bike lights were more expensive ( and there were less to choose from). Then along came the MagicShine 808. As cheap as they were ( quality and price ) they still caught the attention ( and pocketbooks ) of a lot of people. Even the seasoned DIY'ers at the time had to concede that they couldn't make a light for that kind of money.

    Things have changed a lot since those days. Now the Chinese lamps are even more inexpensive. For anywhere between $30-$50 you can get a decent light head ( if you choose wisely ) that will work and work good enough to do serious mountain biking. Your DIY light will be better ( depending on your design and skill level ) but no way will it be easier than just plunking down a handful of bills for a Chinese made lamp. Hard to justify the effort to do a DIY unless you really just want the satisfaction of doing it yourself. Nothing wrong with that if it's your thing.

  6. #106
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    Quote Originally Posted by Cat-man-do View Post
    Nothing wrong with DIY ( although all of this is off topic ), Not everyone wants to fabricate their own light. A few years back when LED lighting was all new, DIY was the "IN Thing" because bike lights were more expensive ( and there were less to choose from). Then along came the MagicShine 808. As cheap as they were ( quality and price ) they still caught the attention ( and pocketbooks ) of a lot of people. Even the seasoned DIY'ers at the time had to concede that they couldn't make a light for that kind of money.

    Things have changed a lot since those days. Now the Chinese lamps are even more inexpensive. For anywhere between $30-$50 you can get a decent light head ( if you choose wisely ) that will work and work good enough to do serious mountain biking. Your DIY light will be better ( depending on your design and skill level ) but no way will it be easier than just plunking down a handful of bills for a Chinese made lamp. Hard to justify the effort to do a DIY unless you really just want the satisfaction of doing it yourself. Nothing wrong with that if it's your thing.
    Yeah, sorry, off topic a bit. I did show how to make up a battery pack too.

    The DIY build I showed is smaller and lighter than the Chinese ones, and the driver is more efficient. The housing is more of a kit than a home-brew.

    The L-flex driver, or the newer less expensive Mobydrv, have a lot more flexibility than the ones in the Chinese lights. I like 5 even levels of brightness, with the ability to go up or down a level easily as opposed to the Chinese clicky on-off type. The low-voltage electronic switching should be more reliable. Also able to use the very latest Cree XML-2 with the nicest compact optic out there, for more output and a choice of beams.

    DIY solder connections seem more solid than the Magicshine types too.

    Here's the thread
    Easy2LED housing with external switch build

    It will cost a bit more, and take more time, but it's a better, smaller light, with excellent battery cells.
    OK, no more hijack.

  7. #107
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    Quote Originally Posted by Cat-man-do View Post
    Hard to justify the effort to do a DIY unless you really just want the satisfaction of doing it yourself. Nothing wrong with that if it's your thing.
    I'll further derail this thread, apologies in advance. More than the satisfaction of doing it yourself for me, is getting exactly what I want. Just like many cyclists will spec their own build or swap parts around on a standard build we all have some particular preference.

  8. #108
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    Cat man do, sorry off topic. I purchased two magicshines (single XML) from GeoManGear right before they bellied up. I then purchased a clone from Amazon. I can't tell the difference, it looks Identical, so I assume I got a junk battery from Amazon. So far, no complaints. The price difference was so great I have to assume it's the battery. Long story...I just wanted to thank you for doing what you do and the review(s) for Leonard.

  9. #109
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    So I just bought two of these batteries and now know it does not have a pcb. I wanted to add a pcb to it but I can't find anything on how to choose a pcb. Does any one know which pcb I should order for this battery pack or better yet how to choose a pcb for battery pack. This is the light I'm going to run them with. SolarStorm 5000 Lumen 2x CREE XM-L U2 LED Bicycle Bike HeadLight found on ebay. I also ordered two lights, one for me and one for a friend. Sorry if this is off topic.

    Thanks,
    Megan

  10. #110
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    Heres the battery pack I ordered. USA 8 4V 7 4V Battery Pack for CREE XML T6 SSC P7 12400mAh Capacity Guaranteed | eBay. It didn't show up in my reply.

  11. #111
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    Quote Originally Posted by kittyloves2bite View Post
    So I just bought two of these batteries and now know it does not have a pcb. I wanted to add a pcb to it but I can't find anything on how to choose a pcb. Does any one know which pcb I should order for this battery pack or better yet how to choose a pcb for battery pack. This is the light I'm going to run them with. SolarStorm 5000 Lumen 2x CREE XM-L U2 LED Bicycle Bike HeadLight found on ebay. I also ordered two lights, one for me and one for a friend. Sorry if this is off topic.

    Thanks,
    Megan
    You could put one of these in line, Megan.
    Protection Circuit LI ION LI PO Battery Pack 7 4V 8 4V | eBay

  12. #112
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    Quote Originally Posted by Ofroad'bent View Post
    You could put one of these in line, Megan.
    Protection Circuit LI ION LI PO Battery Pack 7 4V 8 4V | eBay
    My suggestion would be to ask the seller of the battery if it's possible to add a PCB to the battery FIRST. Since that battery is already built adding a PCB might require removing the shrink wrap and desoldering some of the wires. This is not something a novice will be comfortable with. Hopefully there would be a schematic drawing included with the PCB to help guide you so you know what wire goes where.

    Then again you need to know just how many cells are being used in the build. I figure the battery might have 8 cells. Maybe that's why there is no PCB.

    Lastly, if this is truly a 12400mAh battery and you are going to use it with a lamp like the Solarstorm X2, chances are you will never come close to using all the battery power in one ride but that's my take on it. Without a PCB the biggest worry would be short circuit protection. I don't remember now if the listing on that battery included a fuse. If not you could certainly add one without too much fuss ( assuming one understands basic electronic wiring ).

  13. #113
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    Also protect the pack. Those LiPos are fragile and potentially explosive.

  14. #114
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    Quote Originally Posted by Cat-man-do View Post
    My suggestion would be to ask the seller of the battery if it's possible to add a PCB to the battery FIRST. Since that battery is already built adding a PCB might require removing the shrink wrap and desoldering some of the wires. This is not something a novice will be comfortable with. Hopefully there would be a schematic drawing included with the PCB to help guide you so you know what wire goes where.

    Then again you need to know just how many cells are being used in the build. I figure the battery might have 8 cells. Maybe that's why there is no PCB.

    Lastly, if this is truly a 12400mAh battery and you are going to use it with a lamp like the Solarstorm X2, chances are you will never come close to using all the battery power in one ride but that's my take on it. Without a PCB the biggest worry would be short circuit protection. I don't remember now if the listing on that battery included a fuse. If not you could certainly add one without too much fuss ( assuming one understands basic electronic wiring ).
    I already ordered them or I would have done that... =/ I've done soldering and heat shrinking before. So that is no big deal to me. Here is what the sell says about the battery pack.

    You are buying (1) one 8.4 volt, 91.8Wh, 12400mAh battery pack for the Cree XML-T6 LED or SSC P7 headlight. It can also be used with any device that runs on 7.4 to 8.4V voltage.

    This is a very large pack capable of providing 30W continuously. It can run a 10W light for more than 9 hours or a 30W light for more than 3 hours. I build the battery pack myself, in my spare time as a hobby. Shipping from Houston, Texas via USPS Priority Mail so it will arrive quickly in as little as 3 days.

    Specifications:
    Maximum charge voltage = 8.4V, 4.2V per cell
    Minimum discharge voltage (cutoff) = 6.0V, 3.0V per cell
    Guaranteed capacity = 12400mAh
    Energy content = 91.8Wh (7.4V x 12.4Ah)
    Continuous discharge rate = 0.33C or 30W (limited by the wire size. I can use thicker wires but it won't be as flexible.)
    Pack weight: 18 oz total including connectors and shrink tubing
    Pack dimension: 96 x 70 x 32mm [3.8 x 2.8 x 1.26in]
    Main connector for charging and discharging = 5.5 x 2.1mm female power jack, center pin is positive (+), housing is negative (-)
    Balance connector = JST 3-pin

    Details: Unlike other 8.4V pack, this battery pack is built with a 2s JST connector. This 3-pin connector lets you manage each of the two cell groups independently. The 3-pin connector can be used with any RC balance charger to ensure exact balance between the cells. Pack capacity and longevity are maximized when the cells are in balance.

    Construction: This battery pack is built with four (4) HPPN787196 high quality cells manufactured in S Korea or in Japan. The configuration is 2s2p (2 groups of cells in series, 2 cells per group). Each cell is fully tested and capacity is matched before assembly. The battery pack is tested again after assembly.

    Pack capacity test:
    Balance charge the pack to 8.4V (4.2V per cell)
    Discharge at 4.1A (0.33C) until 6.0V (3.0V per cell)
    Any pack that has less than 12400mAh is discarded.

    12400mAh or 91.8Wh is the minimum capacity of the pack.

    The pack will be shipped at the proper storage voltage, 7.6V to 7.8V. It needs to be charged up to 8.4V before use.

    The Coca Cola can in the pictures is for size perspective/comparison only. It's not included in this purchase.

    Thanks for looking.

    And just so everyone is clear the battery Im talking about is the one in post #85 Page 4... I don't think I can add links yet or I would.

    The fuse sounds like a good idea but I want the pcb to cut the battery off so I don't discharge it to much. I ordered one of the Imax bc ac chargers to charge the battery.

  15. #115
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    Quote Originally Posted by Ofroad'bent View Post
    Also protect the pack. Those LiPos are fragile and potentially explosive.
    Yeah the explosive part I really don't care for lol. The pcb you said to use will work with that light? I don't know enough to know if the pcb and the led driver need to match at all for it to work. I also don't know what driver the solarstorm has... i have to wait till the light gets here to rip it apart.

  16. #116
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    4 - cell 18650 battery/ battery holder

    I thought this was a great find so credit to Kir and to HakanC for pointing out this very interesting battery / serviceable battery holder.

    Oh how I wish these were sold years ago. Right now I have all the batteries I could want so no point in me buying one. Not sure if the plug is MS compatible but likely it is. If I hear differently I'll let you know. Someone be kind enough to give HakanC another greenie ( since they won't let me give him another and he only has one..). Very nice that he pointed out that the battery/holder is sold separately. To whom it may be concerned, these will sell out fast. If you want one buy NOW.

  17. #117
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    Cat those Kaidomain battery packs come with built in PCB, is it ok to use PROTECTED 18650 batteries, or must I rather use unprotected cells? (I have some protected 18560 Panasonics off intl-outdoor.com)
    I would like to charge the pack with my old Magicshine charger or possibly buy a generic Chinese charger.
    Thanks!
    Goatman
    - It's not the destination that counts but how you get there -

  18. #118
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    Quote Originally Posted by goatman View Post
    Cat those Kaidomain battery packs come with built in PCB, is it ok to use PROTECTED 18650 batteries, or must I rather use unprotected cells? (I have some protected 18560 Panasonics off intl-outdoor.com)
    I would like to charge the pack with my old Magicshine charger or possibly buy a generic Chinese charger.
    Thanks!
    If the holder uses a circuit ( PCB ) to protect the batteries "unprotected batteries" would be the better way to go. Not a big issue but I'd go with unprotected cells.

    Since it was mentioned that the holder is not designed to be taken apart constantly, I would think it a good idea to charge the batteries using a standard 7.4volt 4-cell charger. While it is nice to be able to take the cells out and either charge them separately or switch them with others, *I found that changing out cells on a 4-cell holder to be quite tedious. ( * Note, I own a 4-cell holder just not this particular one ) If you can keep the cells inside the housing and charge them without taking them out that is the easier way to go.

    User beware though, cell holders can be problematic. Springs and contacts can lose their tension over time. This could cause unexpected power outages. Every once in a while it will necessary to make adjustments and to deoxidize the contacts.

  19. #119
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    CAT:"Since it was mentioned that the holder is not designed to be taken apart constantly, I would think it a good idea to charge the batteries using a standard 7.4volt 4-cell charger."
    Is there a specific generic Chinese charger that you would recommend? I don't trust my old Magicshine charger, currently made my own 4 protected 18650 cell battery pack that requires me to remove the cells and charge them separately from the pack. This can get a bit tedious, so would prefer an external 8.4volt charger.
    Last edited by goatman; 06-09-2013 at 03:04 AM. Reason: spelling
    Goatman
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  20. #120
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    Quote Originally Posted by goatman View Post
    CAT:"Since it was mentioned that the holder is not designed to be taken apart constantly, I would think it a good idea to charge the batteries using a standard 7.4volt 4-cell charger."
    Is there a specific generic Chinese charger that you would recommend? I don't trust my old Magicshine charger, currently made my own 4 protected 18650 cell battery pack that requires me to remove the cells and charge them separately from the pack. This can get a bit tedious, so would prefer an external 8.4volt charger.
    Oddly enough the only chargers I've ever had a problem with are the one's designed to charge single 18650 cells. I've had two of those go up. Never had a problem with any multi-cell 7.4 volt charger. If you live in the USA you could just order one from ActionLED and be done with it. The cheaper generic Chinese chargers I'd stay away. from if I were you. Nothing wrong with the MagicShine chargers as long as it is one of the ones sold with the newer models. If you have one of the original models then yeah, I wouldn't trust that either.

    ( edit * Goatman, If you still live in South Africa you could order a charger from Xeccon Revolution. Just make sure you get one with the right wall plug. )

  21. #121
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    I second what Cat man do said!!!

  22. #122
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    First: Ordered the 4400Ah 4 cell battery and 1a charger for Xeccon, and got a message they could not complete order and were sending a refund, without specifying any reason why. Both items are indicated as in stock.

    EDIT: Just got notice the problem is shipping batteries by air ( I live in HI).

    Are the magicshine batts/chargers at Action of the same quality/safety?

    Second: Would the 2a charger be appropriate or even better for such batteries? Advantages, disadvantages?

    Third: Below is a steel case for a circular saw I'm thinking about using for indoor charging. Any thoughts on that, and maybe a possible need for venting to relieve possible compression?



    The Battery Thread: 2013-photoiqnu.jpg

  23. #123
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    Quote Originally Posted by pigmode View Post
    First: Ordered the 4400Ah 4 cell battery and 1a charger for Xeccon, and got a message they could not complete order and were sending a refund, without specifying any reason why. Both items are indicated as in stock.

    EDIT: Just got notice the problem is shipping batteries by air ( I live in HI).

    Are the magicshine batts/chargers at Action of the same quality/safety?

    Second: Would the 2a charger be appropriate or even better for such batteries? Advantages, disadvantages?
    The air courier for Xeccon probably doesn't ship directly to Hawaii. Likely there is no air relay from continental USA to Hawaii. Anything ordered from ActionLED should be fine.

    About the charger; would need to see the link. If this is a charger designed to charge a 7.4 volt battery then I'm assuming that the current splits in the parallel battery configuration and each cell sees 1A. This is the maximum recommended charging current for 18650 cells and should be fine. If you want fast charging, this should work.

  24. #124
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    Quote Originally Posted by pigmode View Post
    First: Ordered the 4400Ah 4 cell battery and 1a charger for Xeccon, and got a message they could not complete order and were sending a refund, without specifying any reason why. Both items are indicated as in stock.

    EDIT: Just got notice the problem is shipping batteries by air ( I live in HI).

    Are the magicshine batts/chargers at Action of the same quality/safety?

    Second: Would the 2a charger be appropriate or even better for such batteries? Advantages, disadvantages?

    Third: Below is a steel case for a circular saw I'm thinking about using for indoor charging. Any thoughts on that, and maybe a possible need for venting to relieve possible compression?

    Click image for larger version. 

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    Hi Pigmode, thanks for the updated clarification. We did reply you with an explanation within minutes of the order. Sometimes our updates end up in the JunkMail folder. We communicate and talk a lot. I don't think anybody doubts that. Shipping Lithium batteries by air has been a real challenge since Jan this year. There were problems and restrictions before but it suddenly became a real problem with IATA after the fires in the Boeing 787 Dreamliners. Since then the requirements goal post has been shifting so erratically that now most carriers out of China like DHL, FedEX, UPS will send the items back the moment they detect Li-ion inside. Things are going to get worse, not better.

    Currently the problems are sending from China, and worse, if it's heading to the USA. To other countries it's easier, for now. If it's shipping just a battery pack by itself, forget it. Nobody will legitimately ship it for you. It used to be ok if sent in a set, now that's out too. It can only be sent if it's installed in the equipment. Lets see when this changes.

    We were able to send items ordered lately by mtbr members in the US mainland because we've send the items without batteries and raided Bloomington IN's battery stock to power those lights. I am sure at least one customer will acknowledge this on mtbr soon. USPS is getting very restrictive too so I don't necessarily agree it will be easier for a US seller to ship to HI by air. We have plans to deal with this enduring problem soon.


    2A chargers charge twice as fast but 1A is just a little bit better for the batteries. A slow TLC charge is good for Lithium batteries. Having said that, we supply 2A in AU. Riders have no patience with overnight charging. The aim is a full charge in about 3-4 hours for a 6600mAh pack.

    Coincidental but your charging enclosure looks very much like the box used to house the Lithiums in the Dreamliners. An old paint can will suffice if I was to suggest one. Personally I don't use them. I just charge them under supervision. Charging Li-ion is generally safe but bear in mind this is also dependent on the charger and protection circuit working 100%. It may not have anything to do with the batteries persay. I think the Dreamliner demonstrates no matter how much state-of-the-art tech the plane has, the whole thing got undone by possibly small faulty circuit boards.
    Leonard - All things Xeccon + Beyond
    mtbRevolution.com

  25. #125
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    New Samsung and Sanyo 18650's : Fasttech super deals

    In keeping up to date on the battery world I noticed yesterday that Fasttech is quickly drawing a lot of attention from people in the portable LED lighting world. Fasttech is offering lots of things at really decent prices.

    These Samsung protected 3000mAh cells are just an example. A month ago I paid $11 for "one" Panasonic unprotected 3100mAh cell ( plus shipping ). Fasttech has these Samsungs for $13.31 FOR TWO ( no shipping cost ). That's too good a deal to ignore. They also sell a lot of other 18650 cells made by both Samsung and Sanyo. These are not knock-offs these are the real deal, at least that is what I'm hearing from different forums on the net.

    Lots of goodies being sold over at Fasttech AND AT DECENT PRICES. If you buy 18650's from them just be sure you don't order the Samsung cells that have the 4.35 peak voltage upgrade UNLESS you have the special charger to charge the cells. Yes, Fasttech sells those too. Matter of fact I may decide to try those out myself. The charger cost about $8 so not a big deal. For the time being though I'll likely stick to cells that peak out at 4.2 volts. If you're into torches or 18650 cell holders, Fasttech is the new player on the block for LED Lighting/supplies.

    I have a feeling this might be one of the reasons why Xeccon has decided not to use Panasonic cells.. Hopefuly this type of competition in the battery world will help lower prices on the Panasonic's as well.

  26. #126
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    The Battery Thread: 2013

    Thanks for the update, Cat! Just bought a flashlight to use with my recycled laptop cells, but if I did not have these, I would buy those 2 for sure. Also, buying a nice solid case (saw it somewhere, cant remember where...maybe kd?) to store 4 of those 18650 cells is a great option for me. Cheap, good cell holder with very good cells and plenty of runtime on a not so bulky battery holder.

  27. #127
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    Warning!

    Quote Originally Posted by Cat-man-do View Post
    I thought this was a great find so credit to Kir and to HakanC for pointing out this very interesting battery / serviceable battery holder.

    Oh how I wish these were sold years ago. Right now I have all the batteries I could want so no point in me buying one. Not sure if the plug is MS compatible but likely it is. If I hear differently I'll let you know. Someone be kind enough to give HakanC another greenie ( since they won't let me give him another and he only has one..). Very nice that he pointed out that the battery/holder is sold separately. To whom it may be concerned, these will sell out fast. If you want one buy NOW.
    I decided to try this - the page shows that it will ship in 1-3 days but my order confirmation shows that it is back ordered.

    BEWARE!

  28. #128
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    The Battery Thread: 2013

    That was the holder I was referring to in my last post lol. Thanks for reminding me - it is saved now, in case I ever need one.

  29. #129
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    Quote Originally Posted by PedroDank View Post
    That was the holder I was referring to in my last post lol. Thanks for reminding me - it is saved now, in case I ever need one.
    Like I said before, stuff like this sells fast. You might have to wait a couple months to get it but it will come. I just hope it's worth the wait.

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    Quote Originally Posted by Cat-man-do View Post
    Like I said before, stuff like this sells fast. You might have to wait a couple months to get it but it will come. I just hope it's worth the wait.
    So it seems, but I need a battery now! What would you order to power a 1st gen Magic Shine 816 (the bar mounted triple LED so-said 1400 lumen)?

  31. #131
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    Quote Originally Posted by Biobanker View Post
    So it seems, but I need a battery now! What would you order to power a 1st gen Magic Shine 816 (the bar mounted triple LED so-said 1400 lumen)?
    If urgency is the main issue Action LED has a good reputation for getting stuff out fast to people in North America. This is a good battery, quality cells, the only other thing to worry about is duty fees to Canada.

  32. #132
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    My backordered battery with holder (http://kaidomain.com/product/details.S021564) has apparently shipped.

    I will let you all know 1) if it arrives and 2) how it works when it does. For $17, cant hurt to give it a go I figure!

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    Ok guys,
    I will try to do the job and post a review on this hyped battery holder from Kaidomain: http://www.kaidomain.com/product/details.S021564

    First some photos to get a feeling....
    The Battery Thread: 2013-dsc04472.jpgThe Battery Thread: 2013-dsc04473.jpgThe Battery Thread: 2013-dsc04471.jpgThe Battery Thread: 2013-dsc04470.jpg

    Ok, now the facts:
    1. Plug is not Magicshine compatible!
    2. 18650 cells inside are crap - whole pack got about 2500mAh (instead the mentioned 4800mAh!) - I was expecting this, so not a problem from this side!
    3. discharge cutoff measured at 4,8V
    4. I was not able to test the overcharge cutoff - tested until 8,8V then aborted the test
    5. wouldn't say it is dive proof but should withstand some rain
    6. screws shouldn't be opend too often - screw holes are not the best

    Would say it is sturdy battery holder with some cons - but it should do the trick for us DIY'folks!

    PS: mayby the overcharge protection test can be done from someone who has hopefully more luck......
    ..just ride...

  34. #134
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    My battery also arrived.

    How are you handling the plug? I want to connect it to Magicshines...and although I can get power to the light, it is not the correct plug.

    Not sure how I would check the overcharge protection. That makes me worried!

  35. #135
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    cut the cable and solder a magicshine compatible onto it!
    Other possibility I can think of is to totally pull out the existing cable from the battery compartment and connect a magicshine cable by soldering it to the green pcb!

    anyone tested the overcharge protection yet?
    ..just ride...

  36. #136
    Kir
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    Received the same battery pack from Kaidomain, tried to charge it on my Imax.
    Charging went to 0.4A current and then protection pcb in battery pack activated ("connection break" on display). Thats usually a sign of unbalanced battery.
    Quickly opened it, measured voltage on cells...one pair was at 4.28V, another at 3.98V. Thats the overcharge protection at 4.3v and it works on my battery pack.
    So basically one pair has way lower capacity than another and gets overcharged. If you try to use it like this - you'll quickly kill overcharged pair and since second pair is not getting charged to maximum capacity you'll get ~2000-2500mAh total capacity. If only these packs came with balance lead...

    Gotta measure capacity of each cell and post the result here in a few days, but yeah - consider this a battery holder, not a battery pack. It really needs a quality cells replacement.

  37. #137
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    Quote Originally Posted by Kir View Post
    Received the same battery pack from Kaidomain, tried to charge it on my Imax.
    Charging went to 0.4A current and then protection pcb in battery pack activated ("connection break" on display). Thats usually a sign of unbalanced battery.
    Quickly opened it, measured voltage on cells...one pair was at 4.28V, another at 3.98V. Thats the overcharge protection at 4.3v and it works on my battery pack.
    So basically one pair has way lower capacity than another and gets overcharged. If you try to use it like this - you'll quickly kill overcharged pair and since second pair is not getting charged to maximum capacity you'll get ~2000-2500mAh total capacity. If only these packs came with balance lead...

    Gotta measure capacity of each cell and post the result here in a few days, but yeah - consider this a battery holder, not a battery pack. It really needs a quality cells replacement.
    Kir,

    If you could post some possible solutions and or some suggested replacement cells, it would be appreciated. Thanks.

  38. #138

  39. #139
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    Hey Kir great prices. Is FastTech reliable? I was looking through their site for a good 2S2P battery holder with good and reliable overcharge and discharge protection. Anybody have any ideas for where to get one.

  40. #140
    Kir
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    Very reliable, its one of the best sites with electronic components. You may find these batteries a bit cheaper on aliexpress, but fasttech offers more choices and guaranteed quality. Also use "BLF" or "CPF" coupon at checkout for small discount
    $6.15 2S2P 7.4V 18650 Holder with Battery Build-in PCM Protection Circuit Module at FastTech - Worldwide Free Shipping - holder.
    $4.15 2S1P 2*18650 7.4V Holder Case Battery Li-Ion PCM Protection Circuit Module - max. battery length 67mm at FastTech - Worldwide Free Shipping this one may also work, i use protection PCB from them for building my battery packs.

  41. #141
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    Yea Fasttech has proofed itself as a reliable seller!

    Hey Kir, these protection pcb's from the holders - how reliable are they?
    Heard somewhere that they die after some time or just stopped working?
    Considering to use this holders more often! (have already some on my desk...)
    But if the pcb is known to be not that reliable it doesn't make sense...
    ..just ride...

  42. #142
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    But under the specs it says

    "Over charge detection voltage 4.25V0.025V"

    that doesn't seem like it would work for a 7.4 volt setup. Does it detect charging on individual cells??

  43. #143
    Kir
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    They work fine for me, haven't had any of them die yet.

    And yes, of course they detect voltage on every cell in series - thats the point of protection pcb. Even chinese batteries have same pcb in them with 3 wires like this:
    http://i.imgur.com/BeotWhX.jpg
    Wire on the left is used to detect voltage on each pair of cells.

  44. #144
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    The cheap battery pack starts to look a little expensive when you factor in new cells, pcb and lead - you end up paying $17.40 for the aluminium box.

    I am thinking I might just modify one of these 1pc 18650 Battery Case 2 x Parallel Connection DIY Case | eBay to be 2s1p, add a pcb, some 3400 Panasonics and a magicshine lead & you are good to go

  45. #145
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    New pcb? New lead? This battery pack already had protection pcb built-in. And of course it has power lead, you may add the balance lead though - but it cost 50 cents or so.

  46. #146
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    Quote Originally Posted by find_bruce View Post
    The cheap battery pack starts to look a little expensive when you factor in new cells, pcb and lead - you end up paying $17.40 for the aluminium box.

    I am thinking I might just modify one of these 1pc 18650 Battery Case 2 x Parallel Connection DIY Case | eBay to be 2s1p, add a pcb, some 3400 Panasonics and a magicshine lead & you are good to go
    Look Bruce, you don't want to do that. Makes no sense to buy the best batteries available and then slap them into a piece of plastic junk. You'd be better off buying the cell holders from Fasttech or BatterySpace. Personally I don't like the 4 cell flat packs. I'd buy two of the 2-cell series packs, glue them together to make a 4-square and then wire them in parallel using a MagicShine type connector. Secondly you have to add a strap to keep the cells from falling out. Then just buy a cheap battery bag from almost anywhere.

    Like I said before, ( having used a cell holder before ), it seems like a good idea at first because you can buy 18650 cells separately at really decent prices. The problem is that you will really get tired of removing the cells if you want to charge them separately. You can try charging them like other ( soldered ) packs but don't be surprised if that doesn't work so great. Since the cells in holders are connected only by friction there can be slight voltage drops at the contact points if the cells are not making really good contact with the connectors. This could throw off the balancing action of the PCB. This is why if you use holders it is better to charge the cells separately. After a while it will become a PITA. So much easier to just plug something in. Then again maybe I'm just lazy.

    Anyway, you won't really see a price advantage until you start to buy your second set of batteries. Of course that's only if you continue to use the holder.

  47. #147
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    I'll second Cat's remarks. My experience with battery holders using coil springs, while limited, was poor. The spring allows the battery to bounce off the fixed contact and break the circuit. Depending on your light that makes it turn off or switch modes or maybe just flicker. If you want to use holders get the ones available through Digikey. They have a formed springy sheetmetal contact on each end of the cell. I use 3 packs made with them and never had a problem. More money than the ebay ones, but I am certain you'll be happier with the performance.

  48. #148
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    A few quick points

    I agree it is preferable to solder a pack rather than using springs - I was referring to the kaidoman box above which also uses springs.

    I would prefer to use 2 quality cells to get 3400 mAh than 4 crappy ones to get 4400 mAh. YMMV

    CatMan wiring 2 series holders together is the wrong way round - much better to get 2 parallel holders and wire them in series - for the reasons touched on in this thread

    Kir the reason for changing the cable is that the plug is different from the typical magicshine plug.

    Personally I would not be happy with a PCB like that tested by Whitedog1 & failed to recognise overcharge at 8.8v YMMV

  49. #149
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    Cut off 0.5cm of extra rubber from plug and it becomes macigshine compatible. All these lights use 5.5x2.1mm connectors, just the shape is a bit different.
    My battery charger is very reliable so i don't care about overcharge protection (which was actually working on my battery pack).

  50. #150
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    Quote Originally Posted by Kir View Post
    Received the same battery pack from Kaidomain, tried to charge it on my Imax.
    Charging went to 0.4A current and then protection pcb in battery pack activated ("connection break" on display). Thats usually a sign of unbalanced battery.
    Quickly opened it, measured voltage on cells...one pair was at 4.28V, another at 3.98V. Thats the overcharge protection at 4.3v and it works on my battery pack.
    after this info and
    Quote Originally Posted by find_bruce View Post
    Personally I would not be happy with a PCB like that tested by Whitedog1 & failed to recognise overcharge at 8.8v YMMV
    i disassambled the battery pack again and manually disbalanced (4,2/3,8v) the cells! Then rebuild the pack and connected it to a magicshine carger.
    And...... it quickly cuts off charging after connecting - so I assume that there is some working overcharge protection!!
    Can not explain why in the other test with my Hobby charger the voltage goes up to 8.8V without shutdown! (maybe because i did the test in NiMh mode....)

    Hey Kir any Info according the capacity measurements?
    Quote Originally Posted by Kir View Post
    Gotta measure capacity of each cell and post the result here in a few days, but yeah - consider this a battery holder, not a battery pack. It really needs a quality cells replacement.
    ..just ride...

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