Explosion hazard:
WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
Strictly no flames, sparks, naked light or smoking!
A highly explosive mixture of electrolytic gas is created when batteries are charged. The rooms where charging is carried out must therefore always be well ventilated.
Avoid the formation of sparks when handling cables, wiring and electrical devices.
Turn the ignition lock to the 0 position before disconnecting or connecting the battery.
Do not place tools or any similar object on the battery (danger of short-circuiting and explosion!).