Removing

• Switch off ignition and all electrical consumers.

Vehicles without access and start authorisation system

• Remove ignition key, if fitted.

Vehicles with access and start authorisation system

• Store the ignition key outside the vehicle to prevent the ignition from being switched on unintentionally.

Continued for all vehicles

• Open cover in heat insulation sleeve.
• Connect the battery charging device for battery supported operation.
•  Open cover -4- over negative battery terminal.
• Slacken off nut -6- several turns and disconnect battery clamp -5- of earth cable from negative battery terminal.

Vehicles with start / stop system

• Disconnect the connector -1- on the control unit for monitoring the battery - J367- -2-.
• Slacken the fixing nut -4- and disconnect the control unit for monitoring the battery - J367- -2- from the negative terminal -3-.

Continued for all versions

• Open cover -3- over positive battery terminal.
• Slacken off nut -2- several turns and disconnect battery clamp -1- of positive cable from positive battery terminal.

• Pull heat insulation sleeve -4- upwards slightly.
• Remove bolt -2- on battery retainer plate -1-.
• Pull battery -3- out of battery tray and lift out of engine compartment.

Vehicles with start/stop system

Note

• Because of their higher deep-cycle resistance, only special batteries are used in vehicles equipped with a Start/Stop system.
• When renewing the battery, note the correct part designation.
• Batteries intended for use in vehicles with a Start/Stop system are marked "AGM" (Absorbent Glass Mat) or "EFB" (Enhanced Flooded Battery).

Installing

• Insert battery in battery tray -1- so that battery base strip makes contact at bottom and side of stop -arrows-.

Depending on the battery used in the vehicle, the battery holder is equipped with three securing positions; mount the fixing bar -Position 1, 2 or 3-.

• Place battery retainer plate -1- in position.
• Lug -arrow- on battery retainer plate must engage in recess in battery base strip.
• Tighten bolt -2- for battery retainer plate.
• Connect up battery in the following sequence with ignition and electrical equipment switched off:
• First connect battery clamp -3- of positive cable by hand to positive battery terminal "+" and tighten nut -4-.

• Attach the battery terminal clamp -5- of the earth lead onto the negative "-" terminal of battery by hand and tighten nut -6-.

The following measures must be carried out after re-connecting battery:

• Activate the automatic open / close function of electric window lifters .
• Connecting vehicle diagnosis tester .
• Call up and delete the event memory .

Note After re-connecting the power supply, the ESP warning lamp may not go out until the vehicle has been driven a few metres.