Quote:
Originally Posted by Mosaud1998
There's an auxiliary battery? I thought there was only one and that's under the trunk.
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Generally there are two. The trunk battery is the main or starting battery. The aux battery is in the engine compartment, and (I believe) is used whenever the engine is off, when using the "start stop" function. The aux battery keeps all the accessories, headlights and HVAC running. This way it does not run down the main battery and the car will start easily when you step on the gas pedal.