[lincpimp]

Always seemed to me like parallel wiring of cells caused issues, but this was with MA packs, and during discharge. Not 100% sure if I would parallel different capacity packs together and charge them all at once, but the principle seems sound. Given the dangers of overcharging lipo (see Gee's thread!) I generally stick to charging individual cells in series, either wired as packs or multiples of packs. The current crop in internal balancer equipped chargers monitor each cell, and will stop the charge if there is an issue. So if you have multiple cells in parallel, a cell that will just not accept a full charge could place other cells in an overcharged state, not good. Yes this is unlikely, but I usually charge my packs unattended, so I like to remove as many variables as possible.

Seeing that HC has a 4 position charger that can handle 4 different battery types at the same time with 50watt output per for 100 bucks... Well if I had to charge alot of packs at the same time (especially packs that can only handle 50watts or less max charge rate) that would be what I would buy as it is more versatile. Just my 2 cents.

Imagine a 4s setup in an emaxx running a pair of 2s 5000mah packs. You could have 4 sets of packs, and 1 of those 4 position chargers and almost run continiously. You should get about 20mins out of a pair, and have 1 charged pair ready and 2 others on the charger at the same time. After you run the 1st pair let them cool, and run the second. Put the 1st back on the charger as you run the 3rd pair and you can run the 3rd and 4th while the 1st charges again. Even better if you ran a lower discharge load setup, of maybe a 2s vehicle.