Porsche 996 TT, Repair Manual

Page: 392 / 2099

2. Remove battery cover.
3. Unscrew battery plugs.
4. Shine a torch into the battery. The electolyte level of the battery must be at the protruding lug .
If the acid level is too low, refill distilled water using the battery filling bottle.
5. Screw in plug of the battery again and ensure that it is seated correctly.
6. Remount battery cover.
top of page
Checking gravity of electrolyte
CAUTION
The accident prevention regulations must be observed when handling battery acids.
Wear suitable protective clothing.
Observe the disposal regulations for batteries when disposing of batteries and sulphuric acids.
Note
Use commercially available battery acid tester. Gr. 3.0.6; Workshop Equipment Manual •
The electrolyte gravity test provides information about the state of the battery in connection with the
battery load test •
The temperature of the battery acid must be at least 10°C . •
The gravity of electrolyte must be checked in all battery cells as follows.
1. Switch ignition off and remove ignition key.
2. Unscrew all battery plugs (plugs of the battery cell).
3. Dip the acid siphon or the pipette into the battery cell and take up the battery
acid.
4. Read off the gravity of electrolyte in kg/dm³ on the scale of the battery acid tester and compare with
the following table.
Battery charging condition in
normal climatic zones Spec.
gravity in
kg/dm³
discharged 1.12
half charged 1.20
well charged 1.28
einordnung
Check acid level 329