Quote
Supposedly if you have two batteries, and there is a slight voltage difference between the two as they self-discharge, the lower voltage one can pull current from the higher voltage one and end up discharging both of them.


This is a valid problem and bites one the most when one of the paralleled batteries gets old near it's life expectancy. Note, this is only a problem when the current draw from the paralleled batteries is not strong enough to draw the combined voltage at or below the resting voltage of the weaker battery. Most often that is when nothing is drawing on the batteries, but it can still happen even when there is only a small draw. If the batteries are always being charged or discharged it isn't an issue. However if they spend allot of time idle, then it can be an issue. How much of an issue, I don't know.

-- Bryan