Sounds like a sulfated battery to me. We had problems with that with military trucks that sat around a lot. If a battery sits around for long periods of time with little or low charge, the sulphur in the acid accumulates on the lead plates and decreases their usefulness. In other words they won't take a "full" charge and will not hold a charge very long. In other words, they are shot! If you have an Interstate Battery store in your area, they will test it and tell you what's wrong. A lot of other parts stores will check it, too, but they only want to sell you a new battery so they almost always will tell you it's "bad". Interstate _at least our local one - will tell you the truth even if they don't make the sale. There are "Battery Rejuvinators" that claim to fix sulfated batteries, but IMHO they're worthless - we tried some on the military trucks and they did absolutely nothing.
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