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Most battery chargers are unable to recharge a completely dead battery. The dead battery to the charger shows as no battery hooked to it and the charger refuses to try to charge. Check out Optima(there are others) whose chargers can deal with this.

You also may try hooking up a fully charged good battery in parallel using jumper cables to the failing battery(negative to negative and positive to positive) and let this set for a few hours. This will transfer energy from the good battery to the failed one. You then may find that your failed battery has regained its mojo and then your charger will happily charge it to full capacity. I would try this before considering it doomed



Check voltage on your battery. If under 10 1/2 volts, it will not accept a charge from most consumer type chargers. If so again,,,hook a fully charged battery in parallel as outlined before all should be well. If your dead battery should get excessively warm, this likely suggests an internal short and battery is probably beyond recovery.

Always wear proper eye protection when dealing with auto batteries,,,,a blown up battery is quite a sight to behold.