Quote:
Originally Posted by johnrobholmes
I have heard of guys plugging 3s packs into a 12v battery to charge them. Let the heat hit around 150F and they are done. Takes 10min or less.
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Yeah, I've heard of that too. If it's the same thing I'm thinking of, they rely on the resistance of a long piece of wire to limit the current somewhat. A VERY poor way to do this. Far too unreliable if someone uses a battery or 12v supply that is higher or lower in voltage, or uses different size packs. It would be easy (and safer IMO) to make a simple and proper 10-20A constant-current circuit and just use a temp probe to stop the charge at a certain temp.