Remove/Install Additional Battery - AR54.10-P-0007LW

WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.

Model 205.012/013/047/053/054/147/212/213/247/253

Model 253.311/353/354/911/953/954

Fig 1: Additional Battery Components Location - Model 253.953

Courtesy of MERCEDES-BENZ USA

	Risk of fire /risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of poisoning caused by swallowing battery electrolyte or absorption of lead through the skin or body orifices. Risk of death due to voltage U >= 30 V AC and U >= 60 V DC.	No fires, sparks, open flames, or smoking. Wear acid-resistant gloves, clothing, and glasses. Pour battery acid only into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
	Notes on battery		AH54.10-P-0001-01A
	Remove/install
1	Remove floor covering in front passenger footwell.		AR68.20-P-2070LW
2	Unscrew nuts (1).
3	Remove footrest (2).
4	Detach strips of felt tape (5).	Check strips of felt tape (5) are firmly seated. Otherwise, a short circuit may occur.
5	Unscrew Screw (3) and remove ground line.	Screw / bolt electrical line to battery terminal of additional battery	*BA54.10-P-1003-01A
6	Using diode test lamp, check on-board electrical system for voltage between positive line of ECO start/stop function auxiliary battery (G1/13) and a suitable ground point.	If the diode test lamp lights up, ↓ Detach ground line from on-board electrical system battery and check the on-board electrical system after completing the work.
			AR54.10-P-0003LW
		Cover positive line of ECO start/stop function additional battery (G1/13). Otherwise, a short circuit may occur.
7	Unscrew Screw (4) and remove positive line.	Cover positive line of ECO start/stop function additional battery (G1/13). Otherwise, a short circuit may occur.
		Screw / bolt electrical line to battery terminal of additional battery	*BA54.10-P-1003-01A
8	Unscrew nut (6).
9	Remove holder (7) with lines still connected.
10	Pull off vent hose (8).
11	Remove ECO start/stop function auxiliary battery (G1/13).
12	Install in the reverse order.

BATTERY

Number	Designation		Model 205	Model 253
BA54.10-P-1003-01A	Screw / bolt electrical line to battery terminal of additional battery	Nm	6	6