Disconnect positive line of on-board electrical system battery (G1).Disconnect ground line of on-board electrical system battery (G1) and protect it against unintentional contact.Remove transmitter key (A8/1) from EIS control unit (N73).
Switch off ignition and switch off all electrical consumers.On-board electrical system battery (G1) Procedure for removing the on-board electrical system battery (G1): Remove the transmitter key (A8/1) from the vehicle and keep it outside the range of the transmitter (at least 2 m). In vehicles with Keyless Go (code 889), press the Keyless Go start/stop button (S2/3) repeatedly until the ignition is switched off.In vehicles with TELE AID (code 855), set the TELE AID to Service mode.The charging time depends on the battery temperature (calculated from outside temperature and engine temperature) and lies in the range of 12.180 min. Voltage of on-board electrical system battery (G1) > 11 V Recharging occurs with current and voltage regulation (U = 13.5.16.6 V).G1/4 Starter battery Starter battery (G1/4) (internal charging) The starter battery (G1/4) is charged by the vehicle power supply control unit (N82/1) under the following conditions:.Connect negative clip (2) of charger to negative terminal of starter battery (G1/4).Connect positive clip (1) of charger to positive terminal of starter battery (G1/4).Check condition of starter battery (G1/4).G1 On-board electrical system battery Starter battery (G1/4) (external charging).Charge on-board electrical system battery (G1).Connect negative clip (2) of charger to negative terminal of on-board electrical system battery (G1).Connect positive clip (1) of charger to positive terminal of on-board electrical system battery (G1).Check condition of on-board electrical system battery (G1).Charging On-board electrical system battery (G1)
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