This is part one showing how I "restore" a "dead" AGM battery that just will not take a charge either from the car's alternator nor from an expensive "smart" battery charger. The battery has only been drained down for a few days. In part two I will attempt to restore an AGM battery that has been hooked up to a newer computer car and was totally dead for over three months. That was a $200 battery when I bought it new! Ouch...

Schumacher Ship N Shore SSC1500A
CTEK charger Multius 7002
Solar BA5 battery tester