landyacht318 wrote:
Do you have another healthy enough battery you can hook the questionable AGM to, in parallel?
YIKES. :E
NOT good advice.
The "healthy" battery can provide hundreds of amps in a short time......and is exactly the OPPOSITE of what he is trying to do, which is limit the charging current.
It looks to me like he has charging equipment that is WAY out of his league. An inexpensive 6 to 10 amp charger should be OK, if left connected for a couple of days. And then leave it DIS-connected for 24 hours. Then check the voltage. Even if it is above 12.6 at that point, it's useful life will probably be VERY short.