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The additional battery found in the trunk beneath the spare tire of the 2014 E350 serves the simple purpose of providing the necessary electricity to kick-start the engine. While the main battery supplies power during starting, the auxiliary battery operates many of the car's accessories. Like all vehicle components, auxiliary batteries wear out over time and will eventually need to be replaced. It is not advisable to drive if you are encountering problems with your auxiliary battery. With proper maintenance, you can anticipate a lifespan of 18 months to 3 years for a 12-volt auxiliary battery. Factors such as usage frequency and battery protection play a significant role in determining how long it will last. Bumpy roads can lead to cell damage, reducing the battery's longevity.
The auxiliary battery of the 2014 Mercedes E350 is situated beneath the spare tire in the trunk.
Can you tell me where the backup battery is located in a 2014 Mercedes Benz E350?
I drive a E250 Bluetec, and its extra battery is stored in the spare tire compartment in the trunk.