Two 3s packs in series make a 6s - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-14-2008, 07:03 PM   #1
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Two 3s packs in series make a 6s

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I am wondering if it is as easy as soldering the output leads on my 3s packs together in series to make a 6s pack? My idea is that I have a few matched batteries that would work well in 3s and 6s configurations. If I make aquick harness, then I can use the packs as 3s or 6s without having to commit to one or the other, does this make sense? mhave any of you done this? I know that I can combine matched packs in parrallel to double the mh, but can I do the same in series to double the voltage??

Thanks in advance.....
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Old 01-14-2008, 07:06 PM   #2
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Yep, it works. It is a trend recently to use 2 3S packs to run the T-Rex 500/ Gaui 550
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Old 01-15-2008, 07:59 AM   #3
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If you're not confident about soldering directly on the battery packs, I'd recommend making up the series harness (three pieces of wire, two male connectors and one female -- or vice-versa depending upon how you've sexed your battery connectors.)

Make sure that the batteries are matched (same manu, same capacity).
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Old 01-15-2008, 08:26 AM   #4
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Old 01-15-2008, 11:03 AM   #5
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I would be inclined to make a harness rather than solder the two packs together for two simple reasons.

1) You have more flexibility with having the option of 3S or 6S simply by using the harness.

2) It makes charging and in particular, balancing, much easier if you charge as two separate packs. Unless you have a charger that is capable of balancing in series and keeping all 6 cells together.

It is also recommended when using two packs together that they be comparable in make, age and number of cycles. Don't run a new with an old.
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