I have a two batteries that the LaCross BC-900 charger claims is dead. One reads 0 volts and the other reads 0.63 volts. However, some batteries that the BC-900 claims is dead can still be charged/revived via my Maha charger. It seems like the BC-900 is very finicky.
Even so, there are other batteries, that when placed in pairs in my Maha charger, no lights come on. It's as if they are not there.
So how can I tell a battery is really dead?