Warning. Risk of explosion of a discharged battery with a "magic eye". If the "magic eye" is colourless or light yellow, the battery must not be tested or charged. No starting aids must be used! There is a risk of explosion when testing, charging or using starting aids. The battery must be replaced. It is preferable to charge the battery when installed and connected. This is the only way to ensure that the charging current is taken into account in the capacity calculation, which is carried out by the used battery control unit "J367".
Switch off the ignition and all electrical consumers, remove the ignition key. Unlock and remove cover "2" by pressing the place marked "arrow A". Unlock the lock "arrow B" and open cover "1".
Connect the red terminal "+" of the battery charger to the positive terminal and the black terminal to ground "2".
Connect the power plug of the battery charger and turn on the charger. Leave the back cover open during the charging process.
(Content source: the specified website: AUDIMANUAL.ru)