Parallel batteries discussion

[BrianG]

I realize two paralleled batteries (lipos or otherwise) will have the same voltage at the terminal, but that is only because one is equalizing the other. The reason for my argument is that if one is (for the sake of argument) 1v higher than the other, say 5v and 6v, the 6v battery will charge the 5v one with as much current it can muster only limited by the wire resistance and the charging battery's internal resistance. This is because the difference in potential between the two (1v) divided by the current limiting factor, about 0 ohms (wire and internal resistance aside), equals theoretically infinite current. By the way, internal resistance is not the only limiting factor in capacity - it is also the chemical makeup/density; not to mention the internal resistance vs load is probably not a linear curve. I can see how it would be easier to view it that way though.

So, what application does utilize a parallel battery arrangement then (non-lipos)? I do "get out", but any application I can think of either uses larger capacity batteries in lieu of paralleling them, or there is some sort of isolation between them. Please enlighten. ;)

Thanks for the input though. And I don't mean to be argumentative, but like the thread title says; it's a discussion. :)