I am using 4 2 cell 5000mAh 60C LiPo's in series to drive a robot I am building for Robot Wars (Scorpinator - look out for it). Each battery came with a balance cable built into the discharge cables but one of my chargers is capable of charging 8S Lipos (which when connected together these are) so I want to try and charge all batteries together to save time but connected together I end up with an 8S with 4x 2S balance cables - no good.
I have searched all over to see what a 8S balance cable should like e.g. which cables connect to which pins, I have found numerous diagrams but none of them specifically show 4x 2S to single balance cable (I found examples of a single 8S battery and 2x 4S). If and when I get the balance cable sorted should I charge in series or parallel? Is there a formula that explains the why and how of balance cables that can be used for any LiPo configuration rather than having to keep a library of different configs? Ideally I want to understand how the cables connect rather than just find a cable gadget that connects 4x 3pin balance cables to a 9 pin (not that I could find one anyway - I tried!)