Bob wrote:
The one that
had stopped charging read 12.98 volts and the one that was still charging
read 13.98 volts. I am thinking its time for a new charger. (The batteries
are only a few months old)

Next time, reverse the hookups, so each charger is charging the OTHER battery.
If the problem stays with the battery, it's the battery. Not unusual for a few
month old battery to go bad. There are such things as manufacturing defects,
after all.

RichZ©
www.richz.com/fishing