Hi all, I need to parallel two battery packs to get one with a higher supply. These are lithium ion packs, 6 cells in series (so I'll end up with 12 cells in total). From what I've seen when these packs are build commercially, they don't add any protection between the two series strings. I could add a couple of diodes to prevent one pack from charging the other, but I'm not really keen on the voltage drop. Is this even needed? Both packs will be separately balance charged, so in theory all the cells should be roughly equivalent. These are 22.2V packs and I'll be drawing just over 10 amps. If I do need protection (I mean, other than fuses), I welcome your recommendations! Thanks, Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. =A0 =A0 =A0 =A0 -Douglas Adams --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .