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Hi
What Paul says is very important. Those people wanting a cheap way to charge some of those expensive special equipment batteries. If you don't understand the electronics of the system you may end up ruining a very expensive storage cell.
Most of the equipment storage batteries these days require a current source to charge them safely. ie a maximum current of a few amps (reducing as the terminal voltage increases) depending on the size till they reach a specified terminal voltage that indicates full charge where at the charge rate drops to zero.
The car batteries that the cheap chargers are designed for are much more forgiving and will take much more kindly to rough use. (I used to jump start my car with a 24 volt 70 amp supply through a coil of earth wire, no problem).
So if the price of the factory supplied charger for your special battery looks prohibitive it still may be cheaper than a new battery.
Barry
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