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In your 2013 Mercedes SL550, the auxiliary battery is positioned inside the vehicle, specifically behind the kick panel on the passenger's side near the foot area. To access it, you will need to peel back the carpet, unscrew a few bolts, and then carefully use a pry tool to remove the panel. Once you have removed the cover, you will find the battery inside. Replacement batteries can range in price from $80 to $175, depending on the store where you purchase it.
The additional battery is located in the upper part of the front passenger footwell in the 2013 Mercedes SL550.