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Do you know how to read 12vdc on a multimeter or voltmeter? If so, read each individual battery, and just replace the one, or ones, that read less then 10.5 volts. Very likely it has a bad cell in it pulling the other batteries down.

If you get in a bind, and no one can jump you, just stop by WalMart and pick up two $75 batteries. They'll start it if it is only a weak battery issue, and it sounds like you may need at least one anyway.