2S1P 8.4V 3500mAh Battery pack from Kaidomain- Mtbr.com
Results 1 to 17 of 17
  1. #1
    mtbr member
    Reputation:
    Join Date
    Apr 2012
    Posts
    1,806

    2S1P 8.4V 3500mAh Battery pack from Kaidomain

    Recently I've got the pack we were already discussing at the other thread (http://forums.mtbr.com/lights-night-...ce-995303.html).

    It cames in two version where the only difference is the lenght of the cable.
    There is 10 and 60cm cable version:

    Name:  635862818565547759_small.jpg
Views: 1264
Size:  3.2 KB
    http://kaidomain.com/bike-lights-and...ith-10cm-Cable

    Name:  635862399365450884_small.jpg
Views: 1254
Size:  3.5 KB
    http://kaidomain.com/bike-lights-and...n-Battery-Pack

    Both cames with wide stripe pouch which was anavalaible at the time pack was sent to me so I might add description later.

    Basic data
    Battery Cell: 2 x Panasonic NCR18650GA
    Nominal Battery Capacity: 3500mAh
    Charge voltage: 8.4V
    Cont discharge current: 6A
    Cable Standard: 20AWG with 5.5mm x 2.1mm connector
    Cable Length: 100mm or 600mm
    Waterproof: IPX-4 Standard

    So far I've tested capacity and Overcharge/Overdischarge treshholds.

    At my standard 2A load I've got capacity 3270mAh discharged down to 2.6V wich pretty much reflects the cells capacity. Tipicaly capacities are declraed at 0.2C load (ie. 0.7A in this case) which is 1/3 of my test. It is normal that we got less capacity with higher load. Good thing is Panasonic NCR18650GA are designed to support load up to 10A. In a 2S1P setup where load isn't shared between more cells this can be important and there would be less voltage drop. Of course there is small voltage drop over the PCM too.

    Here is the discharge curve:
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-kaidomain-2s1p-panasonic-ncr18650ga-3270mah.jpg
    The curve is pretty high regardles of 2A load. Up to 2800mAh where curve starts to decline it still holds 3.25V so with two led lights you won't notice any degradation of light output.

    You can see there was some difference between cells. I must say my sample came already charged to some degree (8.24V) and I dont know what happened with it before. It might be used/tested by manufacturer or anything else. There was also 0.01V difference between the cells. To see what hapens during charge process I've recorded also this curves to proves cells muches pretty well.
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-kaidomain-2s1p-panasonic-ncr18650ga-charging-curve.jpg

    OK, now some pictures:
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100562.jpg
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100563.jpg
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100564.jpg
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100574.jpg
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100577.jpg
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100578.jpg
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100579.jpg
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100582.jpg
    Good to see there is capton tape used.

    Protection module is overkill for this pack confirmed by Archie (thanks for contribution). It uses APM4008N chips with some basic data found here. Those chips can stand much more current than needed. Later on this PCM will probabbly be replaced with ones found in the 2S2P packs.
    2S1P 8.4V 3500mAh Battery pack from Kaidomain-p1100597a.jpg
    Desoldered PCM and attached it to the Sanyo 4.35V cells to test tresholds. I've got 4.33V for the overcharge and 2.30V for overdischarge. Since those cells are designed to be discharged down to 2.5V the overdischarge treshold is not to low. Of course 2.5V would be better. On the other side overcharge treshold should be bit lower. Since Panasonic cells are quality ones I think they can stand that charge it is just not very good to them.

    Some data for the NCR18650GA cells can be found here: http://www.kaidomain.com/review/NCR1...reviewpage.htm and here: https://www.master-instruments.com.a...t_file/63606/1

    Conclusion:

    Highly recomended. Those two packs looks very good and can be mounted on the helmet. Specialy 10cm cable version was designed to for such use. They are not completly waterproof, but should stand the rain. For usage on the helmet I would add some grease to the bottom of the pack where it can be opend. This would seal it more, but still leaving posibility to open it.

    Pro:
    - high quality Panasonic cells
    - good capacity for 2S1P pack
    - cells can stand higher currents
    - 20 AWG cable
    - rubber sealed pack
    - (to) high current PCM
    - pouch included
    - good price


    Con:
    - PCM tresholds could be better
    - stripes to the PCM and between cells in series could be bit wider



    2nd Aug 2016: Updated links to the product.
    Last edited by ledoman; 10-18-2018 at 09:04 AM.

  2. #2
    mtbr member
    Reputation:
    Join Date
    Aug 2013
    Posts
    829
    Nice pack; thanks!

  3. #3
    mtbr member
    Reputation:
    Join Date
    Apr 2012
    Posts
    1,806
    Side note for 2up light users. Tipicaly most lights with two leds we are using nowadays have unregulated drivers. Since Panasonic NCR18650GA cells have their full capacity discharged down to 2.5V (ie. 5V in 2S setup) you will notice significantly less output before all capacity is used and/or protection trips. So you are already going to know the you are close to the end. This is because voltage from the batteries would drop below Vf of the leds. Good thing with NCR18650GA cells is that this would happen at very end at around 3000mAh or 1.5h of run at 2A load.

  4. #4
    mtbr member
    Reputation:
    Join Date
    Oct 2012
    Posts
    77
    Can someone please recommend a good charger for this pack? i bought one from Hunk_lee off eBay but it is no longer available? Intelligent Smart Charger DC 8.4V 1.5A for 7.4V Li-ion LiPo Battery Pack AU plug

  5. #5
    mtbr member
    Reputation: Ofroad'bent's Avatar
    Join Date
    Jul 2010
    Posts
    1,434
    ITUO sells a fairly decent charger pretty cheap.

  6. #6
    mtbr member
    Reputation:
    Join Date
    Nov 2013
    Posts
    22
    Anyone ever had luck contacting them when not ordering? I ordered this battery and it's been at this status for a long while:

    December 4, 2016 , 1:16 am Processed Through Facility ISC CHICAGO IL (USPS)

    Two emails to kaidomain with no response.

  7. #7
    mtbr member
    Reputation:
    Join Date
    Apr 2012
    Posts
    1,806
    You may also try to contact mr. BanL the KD representative who is member here. I know he is very busy lately, but you can try. Provide order and tracking numbers to him.

    BTW, have you checked with USPS since it has already arrived in the US?

  8. #8
    mtbr member
    Reputation:
    Join Date
    Feb 2016
    Posts
    674
    ISC Chicago is where I ran into problems with this identical pack. That's the last movement the shipment made!Several moths later, I contacted BanL and he got things going. It was worth the wait. Nice 2cell pack.

  9. #9
    Rod
    Rod is offline
    mtbr member
    Reputation: Rod's Avatar
    Join Date
    Oct 2007
    Posts
    5,412
    Quote Originally Posted by ledoman View Post
    You may also try to contact mr. BanL the KD representative who is member here. I know he is very busy lately, but you can try. Provide order and tracking numbers to him.

    BTW, have you checked with USPS since it has already arrived in the US?
    I would recommending contacting USPS too.

  10. #10
    RAKC
    Reputation: tigris99's Avatar
    Join Date
    Aug 2012
    Posts
    7,139
    Welcome to chicago customs intake. They have had these issues for years upon years.

    Email USPS (don't be nice) and go to your post office and have them file an inquiry. Suddenly it will start moving again. They got tired of my phone calls and emails so I think they have list they put me on, because havent had any issues since spring when I called and chewed their asses out. Yeap you can call customs intake directly, post office can get you the number.

    That said, USPS in general has been grade a screw ups for the last 3-4 months. Friend of mine building a fat bike keeps posting screen shots on facebook of their idiotic crap. This time we thought I was going ot have to grab his package in st louis while i was down there because it went clear through 2 hubs that are supposed to service our area and back towards central Illinois. He was literally going to call the STL area hub and tell them to hold it that i would be by to pick it up.

    Its like as soon as fall hits they go completely stupid. And blame it on "holiday rush" instead of admitting they hand bottom of the barrel morons working in sorting around here.

  11. #11
    mtbr member
    Reputation:
    Join Date
    Nov 2013
    Posts
    22
    Filled an inquiry with usps. Hopefully it will start moving.

    On another note is it possible to buy a 2s1p protection circuit used in these cells or something similar? I few a few decent lose cells and don't want to risk drawing them down too far.

  12. #12
    mtbr member
    Reputation: garrybunk's Avatar
    Join Date
    Feb 2014
    Posts
    1,745
    Quote Originally Posted by slug3135 View Post
    Filled an inquiry with usps. Hopefully it will start moving.

    On another note is it possible to buy a 2s1p protection circuit used in these cells or something similar? I few a few decent lose cells and don't want to risk drawing them down too far.
    Sure, see Hunk Lee on Ebay (link to 2S protection circuits, # in parallel doesn't matter): Great deals from A OK battery | eBay Stores . I've used this one (7.4V 2S Li-ion Li-Po Battery Protection Balance BMS PCM Current 7A 2S7AW006 | eBay) in my custom 2S3P 6-cell pack.

    This link may help you (link to my pack build): My Bike Lights - Info, Teardown pics, Beamshots, Current Measurements, etc. . . | BudgetLightForum.com .

    -Garry
    "My Bike Lights" Thread on BLF teardowns, measurements, and beamshots. Moving my photos, PM or post up if you can't see them.

  13. #13
    mtbr member
    Reputation:
    Join Date
    Feb 2016
    Posts
    674
    Could be a case of customs confiscating the Li ion pack. That's prolly what happened with my shipment last year. Chicago is the worst ISC in the country. Never have a problem with NY Cstoms.

  14. #14
    mtbr member
    Reputation:
    Join Date
    Oct 2008
    Posts
    119
    Does anyone think this would hold up to a Ituo XP3 for helmet mount use? I have the 4 cell pack, but its a bit heavy.

    Thoughts?

  15. #15
    mtbr member
    Reputation: garrybunk's Avatar
    Join Date
    Feb 2014
    Posts
    1,745
    I would say yes, but using high mode may drain it pretty quickly. If you use mostly medium (and/or low) and only use high occasionally, then it should hold up. Of course it's only 1/2 capacity, so runtime will be much shorter than a 4cell pack.

    -Garry

  16. #16
    mtbr member
    Reputation:
    Join Date
    Apr 2012
    Posts
    1,806
    Based on XP3 review I would say this pack should last about 50min - 1 hour on full. Since XP3 is mostly overkill on full this time could be easily extended using lower modes as Garry said.
    For Hi mode I've put 50 min as starting time since light ought to be regulated which means it pulls more current at the end. Of course I doubt anyone would use it on full that long. It would be better to use some 2 led light (like XP2 or similar) which needs bit less power, weight less and runs longer. Of course this is me....

  17. #17
    RAKC Industries
    Reputation:
    Join Date
    Jan 2017
    Posts
    3,264
    Did it every time I rode with for 2 seasons. Use high very sparingly. Medium will last a good while. 1.5hr without dropping regulation in medium is longest I pushed it including brief sections of high. Thats riding time, not counting being on low when stopped.

    I use the same basic set up before these packs when I go camping and such. Same cells and a fenix case. Dont get a lot of run time but since I dont use high much anyway never a problem for a 1.5hr ride or so.

    Sent from my SM-G950U using Tapatalk
    Life on a bike doesn't begin till the sun goes down.


Similar Threads

  1. Replies: 493
    Last Post: 01-22-2019, 11:01 AM
  2. Kaidomain battery box work with loose batteries from pack?
    By TiGeo in forum Lights DIY - Do It Yourself
    Replies: 17
    Last Post: 06-22-2014, 10:07 AM
  3. Battery pack help
    By Pete N in forum Lights DIY - Do It Yourself
    Replies: 5
    Last Post: 09-12-2013, 10:06 AM
  4. Need a 2S1P 2x18650 Li-Ion Pack with BMS and a trailtech connector
    By flyingpig in forum Lights DIY - Do It Yourself
    Replies: 10
    Last Post: 12-01-2012, 06:42 AM
  5. pre-made battery pack vs. battery cell holders
    By Andy13 in forum Lights DIY - Do It Yourself
    Replies: 5
    Last Post: 01-28-2011, 11:58 AM

Members who have read this thread: 0

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

THE SITE

ABOUT MTBR

VISIT US AT

© Copyright 2019 VerticalScope Inc. All rights reserved.