Correct answer
Supply electrical equipment and replenish battery energy.
It supplies electrical consumers and replenishes battery energy when the system can provide sufficient current. The alternator converts mechanical energy into electrical energy and regulates charging; if demand exceeds output, the battery may supply the difference. There is no universal discharge time of just over one hour: it depends on battery condition, capacity and consumption. Other vehicles may use a different charging architecture.
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Supply electrical equipment and replenish battery energy.
Send electrical current to the sump oil as its main purpose.
Guarantee the battery can never discharge, even with the engine stopped.
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