Quote:
Originally Posted by Frameside
I would be cautious about this, if you mean drawing starting current with a small capacity slave battery in parallel with the main battery. The current will be significant, and drawn from the higher voltage source. If its capacity is relatively small - a few ampere hours, its voltage will drop and the internal heat can warp or collapse the plates. Also have a mind to the capacity of the cables between the slave battery and the car battery for the same reason.
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The tiny difference in voltage between the batteries, plus the resistance of the cables plus probably a fuse, will limit the current flow.