Quote:
Originally Posted by G.M.
Chisel The batteries aren't "bucking each other". They are in parallel. The voltage in the low battery will increase and the higher one will decrease. You will have a voltage lower than 12 volts out with this combination. Leave them connected a while and the 6 volt battery will get a fast charge and the 12 volt one will get lower in voltage. I'm not sure a battery will explode with the caps on it takes oxygen to have an explosion. G.M.
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Hi GM
With due respect to your vast electrical knowledge and not trying to start a pissing contest. When a battery is installed in an old car there is no current flow from the battery until the ign sw is turned on. Now 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. As a dumb young kid jump starting farm equipment daily, I have experanced quit a few explosions.
Your method of jump starting is a safer solution.