Scared the OP off. Profdant... go out and do equalize charges on your batteries, both of them, one at a time. About 5 amp hours constant until the voltage comes up fully to 16.00V, and then unplug. Old style manual battery chargers are capable of doing this. You do need to monitor the voltage at the terminals. Sometimes continuous recharge cycles only to 14.4V require you to pull the batteries, take them home in the garage and massage them with the full 16.0V equalize charge regime, to desulphate them. Group 31 batteries, due to their compromised car shape and size, are notorious for requiring this to be done frequently.
