61 21 028 Charging battery
If a normal or quick charger is used to charge the battery, the battery must be disconnected from the vehicle electrical system and removed. This prevents damage to paintwork and upholstery.
Ideally, battery charging is performed with BMW-approved charging computers.
In order to prevent malfunctions on the intelligent battery sensor (IBS), the charging terminals in the engine compartment must be used without fail on vehicles with IBS (from E60). On other vehicles, we recommend the charging terminals in the engine compartment are used.
Before charging the battery while it is installed, first carry out a closed-circuit current test. If here the voltage is 10 V or less, one or more of the cells may be faulty or the entire battery may already be damaged. In this case, always remove the battery as escaping gases during charging could damage the interior equipment and trim. Attempt to regenerate faulty cells with low charging current.
If necessary, open existing seal plugs on the individual cells.
To prevent the intelligent battery sensor from malfunctioning, use the charging points in the engine compartment.
OBSERVE INSTRUCTIONS ON INTELLIGENT BATTERY SENSOR/BATTERY ELECTRONICS .
Pay attention when charging the lithium ion battery!
The charging voltage that is generated by existing chargers that are designed for the lead-acid or AGM battery is too high for the lithium ion battery.
This excessive charging voltage may in some cases result in that the separating switch of the lithium ion battery will be opened. This does not damage the lithium ion battery . The separator switch will close again when a charging voltage of < 14 V is applied at the battery terminals.
Before charging a lithium ion battery, adjust the charging voltage of existing charger adapters once.