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| Might be the charger or maybe not. When you buy a battery it should be fully charged or slightly discharged from setting. When you put it on a charger, it could be very possible the charger would detect it as charged and turn off pretty quickly.
If you charge a battery and turn the charger off, wait an hour, it would be very possible to read 13.0 volts on the battery. After it sets for a while, some of the "surface charge" will drain off and the open circuit voltage of the battery should be down in the 12.6 to 12.8 volt range.
I would not be too quick to get down on the charger. Four year old batteries are due for replacement. If they develop shorts in the cells they may not take a charge. | |
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