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During a discussion over a friend's flat car battery they brought out their 'car battery booster' but it soon became apparent to me that that also wasn't working....and so, like most tinkerers, engineers and makers, it ended up on my bench at home.   The unit contained a 12v 13Ah Sealed Lead Acid (SLA) battery, large diameter cables and croc clips for connecting to the discharged car battery, a voltmeter, a light and an external cigarette lighter socket. Charging the booster unit was via ...