Porsche Cayman Owner's Manual page 268

Danger!
Risk of short circuit and explosion, resulting in
serious personal injury or death.
Important: connect the positive (+) cable first,
and then the negative (-) ground wire.
3. Important: connect the positive (+) cable first,
and then the negative (-) ground wire - risk of
short circuit!
4. Push on central vent hose C.
5. Fit plastic lid. Lock turn-locks A.
266
Practical Tips, Emergency Service
Replacing the remote-control battery
The battery should be changed when the range of
the radio remote control becomes smaller or when
the light-emitting diode no longer flashes when the
remote control is operated.
1. Using your finger nail or a small screwdriver,
carefully lift off the cover of the key grip
(arrow).
2. Replace battery (paying attention to the
polarity). Replacement battery - Lithium CR
2032, 3 volts
3. Replace the cover and press together firmly.
Please observe the disposal instructions for
batteries.
Note
Please dispose of batteries in compliance with
any and all government regulations.