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If you're wondering about the auxiliary battery in a 2019 Mercedes Benz S550, it can be found behind the right side of the trunk carpet, near the fuses at the bottom right. The main role of this auxiliary battery in the Mercedes S550 is to supply power to the stop-start feature, ensuring its smooth operation. Additionally, it supports the functioning of various electrical features like GPS and lane assist.
The auxiliary battery on the 2017 Mercedes S550 can be found tucked away behind the panel on the right side of the trunk.