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Checking the condition Fig. 237 Vehicle battery: Electrolyte level indicator Read and observe and on page 203 first. The battery condition is checked regularly by a specialist garage as part of the inspection service. Check the acid level For car batteries with acid level indicator, acidity can be checked on the basis of a colour display. In vehicle batteries with the label “AGM” there is no acid level examination. tap on the indicator before carrying out the check . Black colour – electrolyte level is correct. be replaced. Battery discharge If frequent short journeys are made, the vehicle battery does not recharge suf- ficiently. terminal of the battery or charge the battery constantly with a very low charging current. Charging Read and observe and on page 203 first. Only charge the battery when the ignition and all consumers are switched off. Refer to the instructions of the charger manufacturer. Charging › For vehicles withthe START-STOPsystem or auxiliary heater, connect the terminal of the charger on the battery’s pole, the terminal of the charg- er to the earth point of the engine › For vehicles without the START-STOPsystem or auxiliary heating, connect the charger terminals to the corresponding battery poles ( to , to ). › Plug the mains cable of the charger into the power socket and switch on the device. › After charging has been successful: Switch off the charger and remove the mains cable from the power socket. › Disconnect the terminals of the charger from the vehicle battery. A charging current of 0.1 multiple of the total vehicle battery capacity (or low- er) must be used until full charging is achieved. WARNING ■ When charging the vehicle battery, hydrogen is released - risk of explo- sion. An explosion can be caused through sparking while unclamping or loosening the cable plug. ■ So-called“quick-charging” of the vehicle battery is dangerous and re- quires a special charger and specialist knowledge. Therefore, have“Quick loading” carried out by a specialist garage. Disconnecting/reconnecting and replacing Read and observe and on page 203 first. We recommend you have the battery replaced by a specialist garage. size as the original battery. Connecting/disconnecting › To disconnect, switch off the ignition and disconnect the negative terminal first , then disconnect the positive terminal . › When reconnecting the battery, reconnect the positive terminal first, then connect the negative terminal . After disconnecting and re-connecting the vehicle battery, the following func- tions or devices are partially or completely inoperative. 204 General Maintenance |