Where is the battery located in a Mercedes S500?

[MacJesse]

The Mercedes S500 has three batteries: the starter battery is located under the protective cover on the right side of the engine compartment, with newer versions using a polymer battery positioned at the top left corner of the engine cover; another battery is placed next to the spare tire in the trunk; and the auxiliary battery is housed inside the protective cover on the left side of the steering wheel (dashboard). The Mercedes S500 has a body length of 5159mm, width of 1854mm, and height of 1453mm, with a wheelbase of 3086mm. It is equipped with a full-time four-wheel-drive system, featuring double-wishbone independent suspension at both the front and rear, and utilizes a multi-plate clutch central differential.

[LePreston]

Last week I just helped my brother replace the battery in his S500, and it took some effort to locate it. The battery isn't in the engine compartment of this car - you have to open the trunk to see it. After lifting the trunk floor mat, look carefully on the left side for a rectangular cover with a small handle. Pull hard upward to remove the plastic cover. Hidden underneath is that rectangular battery, still connected with two thick cables. Mercedes hides the battery primarily for weight distribution balance, and since luxury cars have more electronic equipment, keeping it away from the engine compartment's heat makes it safer. Remember to turn off all electrical systems in the car before replacing the battery, and never connect jumper cables to wrong terminals during emergency charging - frying the ECU would be a costly mistake.

[VanAllison]

The battery design in luxury cars like the Mercedes-Benz S-Class is quite sophisticated, typically hidden in the lower left corner of the trunk. Open the trunk, lift the floor mat, and you'll find a rectangular plastic cover near the left wheel arch. Unclip the fastener to reveal the battery itself. This design primarily serves three purposes: first, to avoid the high temperatures of the engine bay affecting battery lifespan; second, to optimize front-rear weight distribution for better handling; and third, to simplify wiring layout in the trunk. A reminder: when removing the battery, always disconnect the negative terminal first, then the positive. For replacement, use an AGM start-stop specific battery—standard batteries won’t last more than six months. It’s also advisable to connect a backup power source to the negative terminal during the process to prevent the anti-theft system from locking up.

[SanJade]

The battery in the old S500 is located under the trunk floor, while the new model might have it under the seat. To locate it specifically: open the trunk and lift the floor panel, there's a black cover slightly larger than an A4 paper on the left side. After releasing the clips, the battery will be exposed. Luxury cars often hide the battery this way to protect delicate circuits and free up engine compartment space for the cooling system. When doing it yourself, pay attention to three points: the disassembly sequence must be negative terminal first, then positive; terminal screws should be tightened to 5Nm; after replacing the battery, reset the power window and sunroof settings by holding the window up button for 15 seconds and then lowering it all the way down to resolve the issue.