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It isn't adviseable to use a battery charger to jump start a car unless the charger has a jump selection on it. Most newer models do have this function. The best thing to do, whether your charger has the jump function or not, is to take out the battery and put it on a trickle charge - usually about 2 amps, until the battery itself is fully charged.

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Q: When using a battery charger that is the charge rate in amps for starting a car?
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