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discharge rate 2c-3c. Is it ok for a drill?

  • Shadowww1 Monday, January 9, 2012 11:39 PM Reply
    Are they connected in series or parallel?
    If series - 10A, if parallel - 2A.
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  • DXmoocow Saturday, January 28, 2012 6:43 AM Reply
    At 4.2V each battery you would need to connect 4 (or 5) in series to get around 18.4v. When you connect in series (ie one battery's positive connected to the next battery's negative, one after the other, with the four batteries in a line) the voltage of each battery adds up, but the overall current output remains the same as if you only had one battery in the circuit. If you connect them in parallel (ie with all the positives connected together, and all the negatives connected together) each battery contributes its current potential while the voltage remains at the level of each individual battery - ie 4.2V. As an earlier poster suggested, you would need to have four batteries in parallel to give you 10 amps (but just 4.2V), then repeat that set up but put each lot of four in series to give you 10 amps flow with a step up in voltage of 4.2V for each parallel grouping (4 groups at 4.2V each, x four groups = 16.8V, with 10 amps flowing) - but this is a maximum (ie, maybe you would need five groups of five in series for more voltage and longer life with high current).
    If this is all too complicated just simply learn about 'series' and 'parallel' battery set ups:
    http://en.wikipedia.org/wiki/Series_and_parallel_circuits
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  • Sofus2 Thursday, February 2, 2012 7:01 AM Reply
    10 A each if in series (+to -). If two and two cells are in paralell (+to+ and -to-) they share the load ie 5A each. But then you need twice as many cells. Or you should have 5 and 5 paralelled (2A each). Cells that you combine in paralell should have the exact same voltage when paralelled (use a resistor or bulb to equalise). Lipo is better. Gives you the amps you need. I started my flat-batteried car a cold below-zero day with a lipo!
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  • Shadowww1 Thursday, February 2, 2012 9:02 AM Reply
    @Sofus2 : actually for drills, car starting etc LiFePO4 (especially genuine A123Systems cells) are best. They last 1000+ cycles, don't drop voltage under huge load (A123 26650's can do 120 amps EACH!), aren't afraid of cold (80% of capacity maintained at -40°C discharge) etc. :)

    + they won't explode like LiPo's sometimes do :P
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    post edited by Shadowww1 on 2/2/2012 at 9:04 AM
  • ItalianBoy Wednesday, February 20, 2013 3:05 AM Reply
    I have built a 18V cordless drill pack with 6*3.2V A123 LiFePO4 cells (around 1100mAh each - actually 19.2V nominal, 21.6V fully charged) and the drill works flawlessly, much better than the NiCd cells it came with. The pack has been running every day for more than a year and I didn't notice any degradation of the performance. BTW, a drill under load will need more than 10A.
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