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  1. #1
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    Li-Po protection

    LiPo packs are great for high-power lights, but they don't have discharge protection.

    Did anyone encounter a ready to use protection board for LiPo packs?
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  2. #2
    Five is right out
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  3. #3
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    This page has loads of Li-Po's with PCB's ready fitted: http://www.all-battery.com/li-polyerbatterypacks.aspx

  4. #4
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    Do we need discharge protection if were using taskled drivers?
    I cant remember if they switch off when they reach the lowest current level set?

  5. #5
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    Quote Originally Posted by Goldigger
    Do we need discharge protection if were using taskled drivers?
    I cant remember if they switch off when they reach the lowest current level set?
    You can set the 'Flex to either warn only or switch off at the voltage you choose. it will however only be checking the whole pack voltage unlike the battery PCB that will check each cell.

  6. #6
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    Those 2 shops have outrageously expensive shipping outside of US.
    Those packs with embedded PCBs don't have balancing leads.

    I have cheap LiPo packs without PCBs, so I'm looking for a universal plug and play solution. (1 board for 2S-6S with connectors)
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  7. #7
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    Quote Originally Posted by zemike
    Those 2 shops have outrageously expensive shipping outside of US.
    Those packs with embedded PCBs don't have balancing leads.

    I have cheap LiPo packs without PCBs, so I'm looking for a universal plug and play solution. (1 board for 2S-6S with connectors)
    There's an ebay all-batterys shop with less drastic shipping cost.

  8. #8
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    I would like to think my little PCB is smaller, than most, and cheaper shipping worldwide...

    comes in a Plug and ride version as well...


    Plug & play 14.8v PCM for DIY RC batt Pack

    hope this helps

    Ktronik

  9. #9
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    Quote Originally Posted by ktronik
    I would like to think my little PCB is smaller, than most, and cheaper shipping worldwide...

    comes in a Plug and ride version as well...


    Plug & play 14.8v PCM for DIY RC batt Pack

    hope this helps

    Ktronik
    Is that just for charging? Or to stop the lipos being damaged from to much discharge?
    I've held fire buying the tenergy lipos..there not protected.

  10. #10
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  11. #11
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    DX sells a low cell voltage warning buzzer for pretty cheap. They make a nice "time to swap batteries" warning buzzer: http://www.dealextreme.com/p/11-1v-b...licopter-35609.

    The LEDs turn red when any one cell gets too low and a really annoying buzzing starts. You can use the buzzer with a 4 cell pack, you just won't get a warning if the cell not plugged into the buzzer goes too low.

    The buzzing is pretty, loud which is nice since I keep my LiPo in a translucent case, the tube a swim towel came in: http://www.swimoutlet.com/product_p/22389.htm?color=210. The tube for the towel will just hold a 4 cell 5000 mAH LiPo battery. Smaller batteries should easily fit. With my big battery I can't really pad the sizes of the tube, but I have 1/2 inch of foam on the bottom. I think it's really important to have some kind of protective case for a LiPo battery. The towel tube is pretty lightweight, but is better than nothing.

    The back side of the tube is flat. I use a 1 inch wide strip of thin aluminum stock (with a 2 inch long 90 degree bend at the bottom) to make a battery mount where one of my water bottles would go. You can also just shove the tube in most water bottle holders. With a couple of velcro cinch straps you wind up with a pretty bombproof battery system.

    Mark
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  12. #12
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    Quote Originally Posted by Goldigger
    Is that just for charging? Or to stop the lipos being damaged from to much discharge?
    I've held fire buying the tenergy lipos..there not protected.
    like most pcb protection circuits, this will do both.

    over discharge in each cell down to 3v
    over charge in each cell, cutoff at 4.2v
    short circuit cutoff
    on this pcb, both fet are rated for 4A max discharge

    these are on all my battery packs I sell, from 1.0Ahr- 2.65Ahr, and so have had no problems for the 6 months I have need running them

    hope this helps

    ktronik

  13. #13
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    Quote Originally Posted by ktronik
    like most pcb protection circuits, this will do both.

    over discharge in each cell down to 3v
    over charge in each cell, cutoff at 4.2v
    short circuit cutoff
    on this pcb, both fet are rated for 4A max discharge

    these are on all my battery packs I sell, from 1.0Ahr- 2.65Ahr, and so have had no problems for the 6 months I have need running them

    hope this helps

    ktronik
    Can you do one for a 7.4v pack? 14.8v one would be usefull.
    how much are they?
    looked on your site, but couldn't get it to load.

    Cheers

  14. #14
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    Quote Originally Posted by Goldigger
    Can you do one for a 7.4v pack? 14.8v one would be usefull.
    how much are they?
    looked on your site, but couldn't get it to load.

    Cheers

    I don't have a 7.4v version at the moment...9 bare PCB 16.5 plug and play...

    K

  15. #15
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    Quote Originally Posted by ktronik
    I would like to think my little PCB is smaller, than most, and cheaper shipping worldwide...
    I remember this board, but I didn't see a price for it.

    My idea is for a universal PCB which could protect packs from 2S to 6S.
    Similar to overdischarge protection is R/C ESCs, where the ESC automatically detects the battery type.

    P.S. and sealed against the environment
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  16. #16
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    Quote Originally Posted by zemike
    I remember this board, but I didn't see a price for it.

    My idea is for a universal PCB which could protect packs from 2S to 6S.
    Similar to overdischarge protection is R/C ESCs, where the ESC automatically detects the battery type.

    P.S. and sealed against the environment
    that would be very handy, all I could offer at this stage is a 9-33.6v (3s-8s) volltage alarm, 3 level led indcator

    so led for high/med/low+ buzzer... Easy to disable buzzer if needed. Hooks to the main power and balance lead for cell level protection.

    Maybe that would work for you???

    K

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