On Sun, 08 Aug 2004 12:50:31 -0400, Matt Colie
wrote:

If you want them to all come back to full
capacity, they must be separated and charged individually. This is not
difficult, it just takes switches and thinking to accomplish. Oh, and
probably an individual charger circuit (multi-battery chargers are
available).

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All of that is theoretically true but in actual practice there are
many parallel battery installations that work just fine without any
special provisions for separate charging. One safety precaution that
seems worthwhile to me (but have never seen implemented) is a high
capacity fuse in the parallel strap. This would offer some protection
in the case of one battery developing a shorted cell, leading to
massive discharge of the other battery.