Batteries losing charge while in storage
My four six volt AGM batteries are losing there charge while the trailer is parked in storage. I disconnected all the wires from the positive terminal but still find them slowly discharging. In a se...
Forum Discussion
BFL13 wrote:I'd put the two bad one's together, charge them as full as possible on a portable charger, disconnect both from each other, let them sit for a couple of days and check the voltage. They each should be no lower than 6.4V. Anything lower is a problem. Could be those batteries are sulfated and need a recovery. Here's a blurb from MEX on AGM conditioning (recovery):
Too bad that 5.9 one is an AGM. If a Wet, you could use an hydrometer and see what's wrong. No idea what to do with an AGM like that. Some AGM guys will no doubt know...
Trends and tendencies: An AGM battery under conditioning cycle will allow the voltage to rise until it seemingly hits a brick wall, sometimes as low as 14.5 volts. There the voltage stops climbing and this is what you are shooting for. When the voltage resumes its climb a good portion of the occluded plates have been "conditioned" about as well as they're ever going to get. Continue on to 15.5 if voltage is increasing slowly but if voltage is steadily rising quickly, the exercise is over. No sense in jamming unwanted wattage into the battery.
