this process I show could work for your batteries. The problem is the battery gets so low in voltage, the charger does not recognize it. You just have to straight charge them by jumping it off from another battery or a dumb charger. Just to get the battery up to a voltage that the smart charger will see.
I have the same issue with my p4 battery but the battery is not puffed up at all what could be the issue and how to fix?
this process I show could work for your batteries. The problem is the battery gets so low in voltage, the charger does not recognize it. You just have to straight charge them by jumping it off from another battery or a dumb charger. Just to get the battery up to a voltage that the smart charger will see.
The problem with my batteries is when they get puffy like this, it will not hold that charge. They are trash at that point.