Does anybody here have any idea how to fast-charge thousands of Li+ batteries efficiently? All cells having a slightly different capacity do you need to charge each cell individually? Does each cell need its own (tiny) controller? Fast-charging also needs to work when one cell breaks down (or has a significantly lower capacity because it has partially broken down). Charging at 1C is easy for one 2.4Ah 1.35V cell. But for thousand of them I think you need some clever trickery. I'm wondering just how much trickery would actually be needed.