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Important Information for Extending (AGM) Battery Life and Battery Performance (60/12)
Vehicle type and situation
Vehicle Type:
Cayenne (92A)/Cayenne S (92A)/Cayenne GTS (92A)/Cayenne Turbo (92A)/Cayenne Hybrid
(92A)/Cayenne Diesel (92A)
Model Year:
As of 2011
Concerns:
AGM starter battery (referred to below simply as “battery”)
Information:
Customer complaints concerning battery-related topics
Recurring customer complaints concerning topics relating to battery capacity and quality.
Information
This “Technical Information” is intended as a summary guide to assist you with the following batteryrelated topics:
•
Basic information on the battery,
•
documentation required,
•
recommended chargers and tools,
•
possible checks,
•
procedure if the battery has to be changed and
•
available reference material.
The critical points:
•
Quality assurance for battery life and battery performance and
•
Trickle charging in the workshop and by customers themselves
should also be generally improved as a result.
Basic information on the battery
Characteristics:
The AGM “starter battery”:
•
•
•
•
•
is absolutely essential for the “Auto Start Stop” function and recuperation,
is totally maintenance-free  no need to add water or check the electrolyte,
is leak-proof and dry,
is not sensitive to vibrations and shaking and
has a high cold-start performance.
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Information
The battery has a limited service life.
The service life of the battery is affected by:
- the driving conditions for the vehicle and
- thus, by the care and maintenance of the battery (trickle charging, etc.).
 If a charger is not connected in order to trickle-charge the battery when the vehicle is idle for extended
periods,
the battery life will be reduced considerably, thereby resulting in natural wear.
Please pass this information on to your customers.
Information
When working on the vehicle:
- using the PIWIS Tester or
- for work that takes longer than 15 minutes,
a charger must be connected in order to trickle-charge the battery.
Special
Features:
Information
The AGM battery:
•
is installed as standard equipment in the vehicle and must not be replaced by a conventional
“starter battery” and
•
must not be opened.
If the battery needs to be replaced, the following data must be entered in the gateway control unit
using PIWIS Tester III (under Maintenance/repairs - Change battery):
•
Serial number,
•
part number,
•
manufacturer and
•
battery size.
The battery sensor:
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•
is connected between the battery negative terminal and ground cable,
•
is an important part of the energy management system and
•
is used to measure battery variables (battery current, battery voltage and negative terminal
temperature) for vehicle electrical system diagnosis.
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NOTICE
A battery charger for providing an external power supply or for jump-lead starting is connected directly to the
battery in the vehicle.
•
Risk of damage to the battery sensor.
•
Battery sensor sends incorrect battery values to the vehicle electrical system.

Always connect a battery charger for providing an external power supply or for jump-lead starting to the
defined connections in the engine compartment.  Workshop Manual '2X00IN Battery trickle charging'
The battery is based on AGM (Absorbed Glass Mat) technology:
•
•
Special micro-glass-fiber mats lie between the lead plates of the battery and contain all the
battery acid.
The sealed system is equipped with a pressure relief valve for the safe discharge of any
gases.
Chemical processes:
The gas produced during charging is transferred through the pores in the glass-fiber mat to the
negative electrode, where it is converted back to water.
 Water loss is impossible during normal operation.
Documentation is essential in the event of a complaint
Documentation:
Information
If a customer complaint is received concerning topics relating to battery capacity and quality, the
following written documentation must be created before carrying out any other work:
•
Create a VAL (Vehicle Analysis Log) and attach it to the job  a charger is required in order to
trickle-charge the battery and
•
Complete the Battery Checklist (see “Standard forms” in the PIWIS information system) and also
attach this to the job.
In order to better evaluate the possible causes, the Checklist should contain the following points:
•
Precise description of the fault types and
•
the vehicle history,
•
the work that was carried out and
•
details of any charger that was used.
 These battery maintenance documents will be reviewed as required as part of the PSA (Porsche
Service Analysis).
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 Furthermore, we reserve the right to reject warranty claims if the instructions and information on
care, maintenance and documentation are not observed.
Recommended chargers and tools
Recommended and suitable battery chargers and battery testers
 An up-to-date list of recommended and suitable battery testers and chargers can be found in the
PIWIS information system, under Workshop Equipment and Special Tools Manual (WEST), chapter 
Workshop Equipment 'WE1393 1 - Battery testers/chargers'
NOTICE
A battery charger for providing an external power supply or for jump-lead starting is connected directly to the
battery in the vehicle.
•
Risk of damage to the battery sensor.
•
Battery sensor sends incorrect battery values to the vehicle electrical system.

Always connect a battery charger for providing an external power supply or for jump-lead starting to the
defined connections in the engine compartment.  Workshop Manual '2X00IN Battery trickle charging'
Chargers:
•
•
•
•
•
•
•
WE1260 - Bosch battery rapid-start charger BSL 2470
WE1391 - Deutronic battery charging computer DBL1600-14
WE1393 - Deutronic battery charging computer DBL800-14
NEW: VAS 5900A - Battery charger, 35 A
NEW: VAS 5903 - Battery charger, 70 A
NEW: VAS 5908 - Battery charger, 90 A
NEW: VAS 5906 - Battery charger
Specifically for customers (see Porsche Tequipment - Accessories and Maintenance):
•
•
•
•
Battery test:
955.044.900.56  Charge-o-mat II
955.044.900.55  Charge-o-mat II (GB version)
955.044.900.54  Charge-o-mat II (USA version, 110 V)
Adapter (required for vehicles without cigarette lighter): 000.043.202.55  Adapter (for Chargeo-matt II and vehicles without cigarette lighter)
 For measuring
- Battery charge state
- Closed-circuit current, open-circuit voltage and battery voltage:
•
•
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WE1253 - Battery tester BAT121
WE1327 - Battery tester Midtronics inSPECT45
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Information
Some of the functions of a battery tester can also be carried out using the
•
9900 - PIWIS Tester III or
•
charger (see operating instructions for the relevant charger)
if necessary.
Part Nos.:
999.  Battery (capacity: 70 Ah)
999.  Battery (capacity: 80 Ah)
999.  Battery (capacity: 95 Ah)
References:
 Workshop Manual '270689 Battery trickle charge '
Checking the battery
CAUTION
Ignition of the AGM battery during charging.
•
Danger of injury and risk of damage to materials coming into contact with battery acid when charging the
AGM battery.

Never enter rooms in which batteries are being charged while holding a naked flame or smoking. Gases
produced by the charging process in the batteries are highly flammable.
Information
Work through the Battery Checklist while carrying out the following steps and document the results
carefully in the Checklist.
The battery temperature must be at least 10 °C (50 °F) when carrying out the checks.
Checks:
The following checks are carried out on the battery for diagnostic and error analysis purposes:
1
General data relating to the vehicle, battery (see below) and vehicle mileage per year.
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Figure 1
 The specifications on the battery (in the vehicle) may differ from the specifications shown in Figure
1
 Illustration ( Figure 1) serves only as an example.
2
3
•
•
•
•
•
Battery type: rating in Ah ( Figure 1 -item A-),
Date of manufacture of the battery (stamped on negative terminal):  Figure 1 -item B-),
Battery I-no. (for 2D code:  Figure 1 -item C-),
Item number ( Figure 1 -item D-) and
Battery manufacturer ( Figure 1 -item E-),
•
Safety instructions and warnings for handling the battery ( Figure 1 -item F-).
Visual inspection of the battery:
2.1
for damage to the housing,
2.2
corroded and/or loose terminals and
Check the battery using a battery tester (see  Technical Information '270600 Recommended
chargers and tools'):
 Battery charge state before and after charging.
4
Charge the battery using a suitable charger (see  Technical Information '270600 Recommended chargers and tools', but with a current rating of at least 40 Ah  Observe minimum
charging time and operating instructions for the charger).
If the previous diagnostics
- indicate clearly that the battery is faulty and
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- there are no discrepancies between the problem found and the customer statement,
 Replace the battery (see  Workshop Manual '27061900 Removing and installing battery').
End of action required.
Information
In the event of technical problems, e.g.
- measurement and test results and/or diagnosis indicate that the battery is defective despite having
handled the battery carefully and
- having trickle-charged the battery,
 the following fault finding/diagnostic steps
must be performed in the entire vehicle electrical system in addition to replacing the battery:
5
Measure the battery voltage using a voltmeter or voltage tester  Workshop Manual '270601
Checking battery with battery tester':
- Battery open-circuit voltage
- Battery voltage with engine running at idle speed and
- Measurement at an engine speed of approx. 3,000 - 4,000 rpm with active loads (light, heating,
air conditioning).
 The PIWIS Tester can also be used for these measurements.
6
Measure the closed-circuit current, see  Workshop Manual '9700IN00 Measurement of
closed-circuit current'
(if the measured value is over 30 mA  determine the cause).
7
Generator test - Measure the generator voltage and charging current:
- Generator voltage with engine running at idle speed and
- Generator voltage at an engine speed of approx. 3,000 - 4,000 rpm with active loads (light,
heating, air conditioning).
- Charging current on the generator with engine running at idle speed (measurement using commercially available clamp-on ammeter) and
- Charging current on the generator at an engine speed of approx. 3,000 - 4,000 rpm (measurement
using commercially available clamp-on ammeter).
Other test methods:
7.1
Using PIWIS Tester III  Go to GFF (“Guided Fault Finding”)  Generator test: Document
'2722' (power supply - control system - supply voltage - charging system) or
7.2
Using PIWIS Tester III  Select DME control unit in the 'Control unit overview'.
The generator voltage is displayed in the 'Nominal values' overview, or
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Alternatively, the voltage can even be measured directly at terminal 30 on the generator in
some cases, depending on the vehicle model.
Voltage drop measurement (max. 0.6 V per line):
- Measured on positive side  between battery positive terminal and generator positive and
- Measured on negative side  between battery negative terminal and generator housing.
9
The following values (see table) can be read out using PIWIS Tester III :
9.1
PIWIS Tester must be connected to the vehicle.
9.2
Switch on ignition.
9.3
Select the relevant vehicle in the “Diagnostics” menu.
9.4
Select the 'Gateway' control unit in the “Control unit overview” menu and switch to the
“Actual values/input signals” menu.
9.5
Answer •YES“ in response to the VAL (Vehicle Analysis Log) prompt.
9.6
Read the campaign information instructions and confirm by pressing •F12“.
9.7
In the 'Actual values/input signals' overview, select “Battery” and “Battery charge state
history” and press •F12“ to confirm.
9.8
In the 'Actual values' overview, select the following actual values:
charge-related ... %
Battery ageing
performance-related ... %
Battery internal resistance
Actual ... mOhm
Battery charge state
... %
Open-circuit voltage
... V
Battery temperature
Closed-circuit current
(Acid) ...
(Terminal) ...
Below limit value (Duration) ... min.
Limit value exceeded (Duration) ... min.
Battery charge state 0 ... 25 %
Battery charge state history
Battery charge state 26 ... 50 %
Battery charge state 51 ... 75 %
Battery charge state 76 ... 100 %
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9.9
Press •F12“ to confirm your selection.
9.10
Read off actual values and enter them in the Checklist.
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9.11
Press •F11“ to exit the display.
9.12
Press •F11“ to go back.
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End of action required.
Additional references, summary
References:
Further technical information about the installed battery type can be found in the relevant
Owner's Manual.
Forms:
- Battery document and
- Battery Checklist
 can be found under “Standard forms” in the PIWIS information system.
Battery trickle charging:
 Technical Information '0X0000 Recommendations and measures for vehicle storage (26/09)'
Testing and checking the battery:
 Workshop Manual '2706IN General information on the AGM vehicle battery'
 Workshop Manual '9X00IN01 Measurement of closed-circuit current'
Disconnecting and reconnecting the battery/removal and installation and replacing the
battery:
 Workshop Manual '9X00IN Work instructions after disconnecting the battery'
 Workshop Manual '27061900 Removing and installing battery'
Working time
Working time:
27060100: Checking the battery
Labor time: 20 TU
27068950: Charging the battery
Labor time: 20 TU
27061900: Removing and installing battery
Labor time: 15 TU
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Labor time: 50 TU
27065500: Replacing the battery
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. If a particular condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your authorized Porsche Dealer for the latest information
about whether a particular technical bulletin applies to your vehicle. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify the current and
correct part numbers. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS
Tester are the ones that must be followed.
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Shop Foreman
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Service Technician
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Asst. Manager
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Dr. Ing. h.c. F. Porsche AG is the owner of numerous trademarks, both registered and unregistered, including without limitation the Porsche Crest®, Porsche®, Boxster®, Carrera®, Cayenne®,
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Porsche Cars North America, Inc. believes the specifications to be correct at the time of printing. Specifications, performance standards, standard equipment, options, and other elements shown are
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