The only battery that should be sold is Interstate. They only get overhauled 3 times, tghen sold as no good. My shop sells only Interstate and when the guy comes every month, the ones that sit, get replaced. 14.5 volts is great charging for your car, but the bigest thing is amps. You have to check the amps. A good alternator will not charge a bad battery. Sounds like you bought a sears batt and you need to go buy quallitiy