>How do I figure out if the battery has a shorted cell without just going
>to buy another?  If I recharge it overnight and the voltage goes up
>higher, to the 12.65V or so that Alistair mentions, does that mean it
>doesn't have a shorted cell?

Measurements are good, but if things are questionable, its time to take it
to a FLAPS or a battery store and have it tested under a load.

Keep it simple :-)

John