Quote:
Originally Posted by Chisel
. . . you come along and hook a 12V jumper battery on a 6V system. + to + and - to - you have a series circuit. 12V source bucking a 6V source. The 12V source will over power the 6V source and will cause heat in the battery and hydrogen gas will escape the battery and if there is a spark near by--boom.
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I highly doubt that the cables hooking those two batteries of different voltage together would last long enough to heat up the batteries. In my experience the cable heats up and starts burning off the insulation way before either battery heats up as much.