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Home >> BMW >> 2018 >> M4 2D Convertible, Automatic DCT Trans >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> General Electrical System - Repair -- M4 (F82 & F83) >> 61 20 Battery >> Charging battery

Charging battery

WARNING: Observe SAFETY INSTRUCTIONS  for handling vehicle battery.
IMPORTANT: Lead-acid battery. AGM battery  :
To prevent the intelligent battery sensor from malfunctioning. Use the charging points in the engine compartment.

Observe instructions on INTELLIGENT BATTERY SENSOR/BATTERY ELECTRONICS .

NOTE: Use BMW-recommended charging computers* to charge the battery.

Pay attention when charging the lithium ion battery! 

Existing chargers that are designed for the lead-acid or AGM battery generate a charging voltage that is too high  for the lithium-ion battery.

If the charging voltage is too high, the electronic disconnect switch of the Li-ion battery can open, which generates a CCM message in the instrument cluster.

Before charging a lithium ion battery, adjust the CHARGING VOLTAGE OF EXISTING CHARGER ADAPTERS ONCE .

Follow notes on LITHIUM ION BATTERY .