Modifying Lipo Batteries - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-07-2009, 01:26 AM   #1
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Modifying Lipo Batteries

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As a prelude, let me say, pls. treat this as a hypothetical question. I am very aware of the dangers of lipos bursting into flames & am not about to attempt what I am asking for information on - just want to know if it is feasible.

I have a 4S lipo which has one bad cell. 3 cells charge to full capacity/voltage - 4.20 volts but the fourth only charges to 3.95 volts no matter how many times I try discharging & recharging. What I want to know is whether it is possible to remove the bad cell & create a 3S pack. Looking at a diagram of how the 4S is put together, it seems theoretically straightforward. However, what are the practical aspects? Is it possible to unsolder/resolder connections without destroying the cells due to heat applied? I understand the + and - terminals of the cells are very close together. Is it feasible to unsolder/resolder without shorting them?

Has anyone done this?

Thanks for any info. you can provide.

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Old 09-07-2009, 02:19 AM   #2
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Re: Modifying Lipo Batteries

I've heard of it done it before, took a 6S pack and converted to 2 x 3S. As with soldering any batteries the shorter the time it takes the better which is why you need a very hot soldering iron. Remember you have to change out the balance taps to one for 3S as well.

Check youtube I think there are videos on how to do it.

Last edited by waylander; 09-07-2009 at 02:27 AM.
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Old 09-07-2009, 08:24 AM   #3
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Re: Modifying Lipo Batteries

You could try to find someone with maybe a better charger. Not sure what you are using for one. Also you make no mention of balancing. Maybe you can try it as well.
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