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Re: BEST TESTER FOR BATTERIES
Posted to Tool & Equipment Forum on 6/26/2021 32 Replies

Robert, hello. When you jump a weak/dead battery with a jump box, and there is a spark, this is because the low voltage of the weak/dead battery causes a high current flow into it from the good battery. Yes, the jumper will start charging the weak battery, but... Login to read more.

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