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Use a battery maintainer.
Either there is a dead cell in the battery or something is drawing power from the battery. Even a good battery will slowly discharge over time. Normally it will take months.
To get the rated capacity, limit the discharge rate to 0.25C
chemical reactions take place in battery which reduce the charge.
It depends on the type of battery, and the capacity of the battery, and the application you are using the battery for.
recycle it
6-12 hours. The older your battery, the quicker it will discharge.
I don't know what kind of car you have but the heated seats in my Equinox shut off when the key is turned off.
What kind of discharge? More information is needed.
Automotive battery is used for cranking purpose of a vehicle,it needs high current discharge at the time of ignition.Where as an Inverter battery used as a power bank and its discharge is need based at the time of power failure.
No, a starter cannot cause a battery to fail to charge. It could cause the battery to discharge quickly.
The battery will attempt to charge the charger since the battery is at a higher voltage than the charger. Thus, the battery will simply discharge and generate heat. If you leave it plugged in long enough, eventually the battery will discharge to a point where it can maintain only 6V, where it will stay until you actually charge the battery.