Parallel and Series

by FliteTest | March 16, 2011 | (16) Posted in Tips

Have you ever needed more flight time but all you have are small batteries? Or maybe you need a 4 cell, but all you have is 2 cell batteries. Well, let Josh and Josh illustrate a couple of very useful ways to implement a couple new custom battery connectors.

COMMENTS

panther3001 on July 19, 2013
Josh Bixler, around 4:42~4:50 you say that putting two 2200 mAh 20C batteries in parallel still gives you only 44A max current draw. This is incorrect. The max current draw is equal to the capacity times the C-rating (which is simply a capacity multiplier in units of Amps instead of Amp-hrs), so if you double the capacity of the battery, you *do* in fact double the max current draw. 2.2Ah x 20C = 44A. But 4.4Ah x 20C = 88A, so the 2 in parallel do double your max current. The limiting factor in this case might be the connector (maybe it's an XT-60, limited to only 60A continuous), or even the total battery lead length (can cause inductance-induced voltage spikes and damage your ESC [http://www.rcgroups.com/forums/showthread.php?t=952523]), but it won't be the battery pack (2 in parallel) max current rating so long as your current draw is below 88A in this case.
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panther3001 on July 19, 2013
on second thought....if what you are saying is that if an airplane draws 44A max on one 2200mAh Lipo, it will still draw ~44A on 2 in parallel, that is basically correct. 2 in parallel will have a lower internal resistance than one alone, so current draw on that plane will increase slightly, but not much.
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gector on November 13, 2013
Smooth. Just smooth.
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JoseQM on March 10, 2016
Good and useful information.
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Parallel and Series