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Thread: Parallel Batteries?

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Old 07-24-2013, 10:16 PM   #1
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Default Parallel Batteries?

If I want to run two 2s 5000mah lipos in parallel, do I need a seperate low voltage cutoff for each? How would I go about doing that?
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Old 07-24-2013, 11:23 PM   #2
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Default Re: Parallel Batteries?

Interesting question. The esc measures voltage across the battery for cutoff. Running in parallel you will stay at 7.4 nominal. Everyone's happy. Not really. Now you are in 2 series (s) and 2p (two cells parrelel). Esc still measures terminal voltage for cutoff protection, but now two cells are connected for extra capacity. If the cells are perfectly mached in voltage and are able to discharge staying perfectly mached to one another, everything's good. In the real world cells always discharge at a slightly different rate. So now the esc cuts off at 6.0 volts (normaly), but one of those 4 cells will most likely be below 3.0 volts. Best bet is set the cutoff at 3.2-3.4 volts. This setting is conservative, cells will be happy, and since you have doubled your capacity from parrellel hookup, you can afford to be conservative.
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Old 07-25-2013, 12:47 AM   #3
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Great answer. Dead on target! Wish I'd said it.
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