Where is the battery located in an Audi A4?

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Audi A4's battery is located in the trunk, beneath the spare tire after opening the trunk. Additional information is as follows: Car batteries, also known as storage batteries, are a type of battery that works by converting chemical energy into electrical energy. They are categorized into conventional batteries, dry-charge batteries, and maintenance-free batteries. Typically, what people refer to as car batteries are lead-acid batteries. The normal service life of a car battery ranges from 1 to 8 years, largely depending on the vehicle's condition. When the car is not used for an extended period, it is advisable to disconnect the negative terminal of the battery to prevent battery drain. If the car remains unused for a long time, it's beneficial to take it out for a short drive occasionally, allowing the alternator to recharge the battery. During winter, try to avoid leaving the car parked outside overnight, as this may lead to difficulty starting the engine the next morning. The low outdoor temperatures in winter can shorten the battery's lifespan. During routine maintenance, have a technician measure the battery's internal resistance and voltage to assess its condition.