Originally Posted by
Roelof
I see one problem with parallel charging.
If you have one empty and one full battery ad lets say you charge 2C basec on the capacity of both batteries toegether then the empty one will get almost 4C charge.
In seril you do not have that problem.
The OP will never experience this problem, he's running both packs in the same car in series.
Far easier to charge them in parallel, though here's a wiring layout for charging in series yourself, note that the side with the true negative has the positive lead hanging off, this prevents the circuit from shorting:
I will be happy to make you one of these series balance harnesses for $10 shipped in the CONUS if you want one, but honestly there's no difference with charging the packs in parallel with respect to keeping the cells balanced.
Here's the SMC article about the risks of running packs in series:
https://www.smc-racing.com/index.php...y&path=174_166
*** most important thing is to rotate the packs every cycle to even out the distribution of IR between both packs.