I have a 1 1/2 year old group 65 diehard platinum that is giving me problems. Over the past weekend I put it on a "smart charger" @ 2 amps. The charger is supposed to charge and then float depending on the battery condition.
Over 2 different charging sessions, it gave me an error of "battery will not accept charge after 18 hours" and "battery has open cell".
I checked the resting voltage today and read 12.4 which to me is NOT fully charged. I took it back to sears and they checked it, charged it and it said good battery but still rests at 12.4.
I have a DC power alternator and when running, my car when warm will only charge at 13.8 volts.
Am I missing something here?