BMW M COUPE Manual page 168

Battery
168n
If you intend to store your car for longer
than twelve weeks: Remove the battery,
charge it and store it in a cool (but frost-
and dust-free) room. Every three months
and before reinstalling the battery, have
it recharged. If it is not recharged, it
will not be serviceable. Every time the
battery is discharged, especially over
extended periods, its service life is
reduced. Refer also to page 140.
Return used batteries to a recy-
cling point or your BMW center.
Maintain the battery in an upright posi-
tion for transport and storage. Secure
the battery against tilting when trans-
porting.<
Removal and installation
Do not disconnect the battery ca-
bles when the engine is running.
Disconnecting the battery cables when
the engine is running will cause a volt-
age surge which will damage the vehi-
cle's onboard electronics.
Do not make any modifications in the
wires leading to the positive terminal. If
you do so, the Battery Safety Terminal's
safety function will no longer be guaran-
teed. Repair and disposal must be per-
formed by trained technicians
When removing the battery, disconnect
the negative terminal first, then the pos-
itive terminal.
Unscrew the battery retaining clamp.
Z3 coupe: Loosen the screw (arrow) on
only.<
the battery safety bar and remove the
bar.
When installing the battery, connect the
positive terminal first, then connect the
negative terminal.
When installing a battery, be sure
that the battery, the safety bar
(Z3 coupe) or the cover (M roadster,
M coupe) are mounted properly. If this
is not done, the battery will not be ade-
quately secured in case of an acci-
dent.<
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Z3 coupe