1. ENGINE OFF: Battery energy is used to operate the lighting and accessory systems.
2. ENGINE STARTING: Battery energy is used to operate the starter motor and to provide current for the ignition system during cranking.
3. ENGINE RUNNING: Battery energy may be needed when the vehicle's electrical load requirements exceed the supply from the charging system.
In addition, the battery also serves as a voltage stabilizer, or large filter, by absorbing abnormal, transient voltages in the vehicle's electrical system. Without this protection, certain electrical or electronic components could be damaged by these high voltages.
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