Porshe 911 (997). Manual - part 1192

Note

After charging and waiting for at least 2 hours, during which time the battery should neither be
loaded nor charged:

• 

1. Switch off ignition and remove ignition key.

2. Disconnect ground strap on the battery.

3. Measure the battery voltage with a hand-held multimeter.

–  The battery open-circuit voltage should not fall below 12.5V.

–  If the hand-held multimeter shows 12.5V or more, the battery voltage is OK.

–  If the hand-held multimeter shows a battery voltage below 12.5V: Charge battery.

Battery load test

Note

The acid density test provides information about the state of the battery in conjunction with the
battery load test.

• 

A battery test device is required for the load test.

• 

The battery need not be removed or disconnected.

• 

The battery must be charged before the load test is performed.

• 

Carrying out battery load test:

1. Switch off ignition and remove ignition key.

2. Observe the information in the operating instructions of the battery test

device.

3. Connect the clamps of the test lines to the battery terminals as described in the operating instructions of

the test device.

–  As the load current varies, the current must be set depending on the battery capacity (operating

instructions of test device).

4. Perform the battery load test in accordance with the operating instructions.

–  The result of the battery load test is a voltage value that must be compared with the specified

minimum voltage (limit value).

Table:

Battery capacity:

80 Ah

Cold test current

380A

Load current

300A

Minimum voltage (limit value)

9.5V

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Open-circuit voltage measurement

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5. If the minimum voltage is not attained, replace battery.

Remarks on battery load test:
The battery voltage sinks during this test due to the severe load on the battery.
If the battery is in order, the voltage value only decreases to the minimum voltage.
If the battery is faulty, the battery voltage will sink very quickly below the specified minimum voltage.
After the test has taken place, the low voltage value remains over a long period of time; the voltage increases
again slowly.

Charging battery

Note

A battery charging device is required.

• 

Observe charging device operating instructions.

• 

The battery must have a minimum temperature of 10°C.

• 

If possible, do not fast charge batteries as this can damage them.

• 

If exhaustively discharged batteries are charged quickly, they will not take up a charge current or
they will be identified too early as full due to the so-called "surface charge".

• 

1. Switch off battery charging device.

2. Switch off ignition and remove ignition key.

3. First disconnect the ground strap of the battery, then the positive battery

line.

4. Connect positive line of the battery charging device to the positive terminal of the

battery.

5. Connect negative line of the battery charging device to the negative terminal of the

battery.

6. Set the charge current on the battery charging device according to the battery capacity.

7. Switch on battery charging device.

Procedure for charging totally discharged batteries:
Batteries which are not in operation for a long period of time discharge.
A battery is totally discharged if the open-circuit voltage has sunk below 11.6 V.
In totally discharged batteries, the battery acid (sulphuric acid and water mixture) consists of virtually only
water, as the sulphuric acid proportion is considerably reduced.
Totally discharged batteries sulphatise, i.e. the entire plate surfaces of the batteries harden.
If totally discharged batteries are immediately recharged after an exhaustive discharge, the sulphatisation
recedes again.
If these batteries are not recharged, the plates continue to harden and charge take-up ability is limited. A
reduction in the battery performance is the result.
Totally discharged batteries must be charged with a low charge current as follows:

– 

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Battery load test

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Set charge current at maximum 10% of battery capacity, i.e. with a 80 Ah battery the charge current is
maximum 8 A.

8. Charge

battery.

997110, 997111, 997120, 997121, 997310, 997311, 997320, 997321, 997410, 997411, 997430, 997431,
997610, 997611, 997620, 997621

WARNUNG

Gefahr des Verlusts der Text-Bild-Zuordnung beim Ausdruck.

Aus technischen Gründen kann derzeit nicht ausgeschlossen werden, dass trotz
einwandfreier Darstellung auf dem Bildschirm beim Ausdruck der
Zusammenhang von Text und zugehörigem Bild verloren geht.

• 

Wird der Fehler nicht bemerkt, besteht die Gefahr, daß Arbeiten nicht korrekt
durchgeführt werden und es dadurch zu Personen- und Sachschäden kommt.

• 

→ Vergleichen Sie deshalb nach dem Druckvorgang unbedingt die Ausdrucke mit der
Bildschirmdarstellung. Korrigieren Sie die Ausdrucke im Fehlerfall so, daß der Inhalt der
Bildschirmdarstellung zutreffend wiedergegeben wird.

WARNING

Danger of losing text-figure correspondence when printing out.

For technical reasons, it can currently not be ruled out that the correspondence
between text and associated figure can be lost when it is printed out, even though
the display on the screen is correct.

• 

If the fault is not noticed, there is the danger that work will not be performed
correctly which can cause injury and damage.

• 

→ Therefore, always compare printouts with the screen display after printing them out. Correct
the printouts if they are faulty so that the content of the screen display matches that on the
printouts.

AVERTISSEMENT

Risque de perte de la correspondance texte-illustration lors de l'impression papier.

Pour des raisons techniques, il ne peut pas être exclu à l'heure actuelle que, même
en cas d'affichage correct à l'écran, la correspondance entre le texte et l'illustration
puisse être erronée sur l'impression papier.

• 

Si l'erreur passe inaperçue, on court le risque d'exécuter certaines opérations de
manière incorrecte pouvant conduire à des dommages corporels et matériels.

• 

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Charging battery

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→ Comparez impérativement pour cette raison les impressions papier avec l'affichage à l'écran.
Corrigez-les en cas d'erreur de manière à reproduire correctement l'affichage à l'écran.

ATTENZIONE

Pericolo di perdita dell'abbinamento testo-immagine nella stampa.

Per motivi tecnici non è escluso che, nonostante la rappresentazione sullo schermo
risulti perfetta, durante la stampa venga persa la corrispondenza fra testo e
relativa immagine.

• 

Se tale difetto non viene rilevato vi è il pericolo che i lavori non siano eseguiti
correttamente; ciò può avere come conseguenza lesioni e danneggiamenti.

• 

→ Per questo motivo, dopo la stampa è assolutamente necessario confrontare le stampe con la
rappresentazione sullo schermo. In caso di errore si prega di correggere le stampe, così da
garantire la riproduzione esatta della rappresentazione sullo schermo.

ADVERTENCIA

Al imprimir se corre el riesgo de perder la correcta asignación de las figuras al texto.

Por motivos técnicos, por el momento no se puede descartar que, aun siendo
correcta la imagen que aparezca en la pantalla, al imprimir se pierda la
correlación entre el texto y la figura correspondiente.

• 

Si este error pasara desapercibido, existe el riesgo de que los trabajos no se
ejecuten de forma correcta y, por tanto, se produzcan daños personales y
materiales.

• 

→ Por ello le rogamos que tras el proceso de impresión compare siempre las copias impresas con
la imagen de la pantalla. En caso de error, corrija las copias impresas de forma que se
correspondan con el contenido de la imagen de la pantalla.

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Charging battery

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