Porsche 911 GT3 Owner's Manual page 215

Removing the battery
The required tool is in the tool kit.
The battery is located in the luggage compart-
ment under a black plastic lid.
Warning!
Risk of damage to alternator and electronic
control units.
f Do not disconnect the battery while the engine
is running.
This also applies to cars equipped with a
battery main switch.
f Never drive the car with a disconnected
battery.
Risk of caustic burns from escaping acid.
f Keep vent caps on to avoid spillage.
f Do not tilt the battery when removing and
installing it.
214
Practical Tips, Emergency Service
1. Switch off engine and all electrical loads.
2. Open turn-locks A.
Remove plastic lid.
3. Pull off central vent hose C.
Danger!
Risk of short circuit and explosion, resulting
in serious personal injury or death.
f Important: disconnect the negative (–) ground
wire first, and then the positive (+) cable.
4. Important: disconnect the negative (–) ground
wire first, and then the positive (+) cable -
danger of short circuit!
5. Unscrew fastening screw B.
6. Remove battery.