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Practical tips
These workshops have the technical docu-
mentation and equipment required to find
out the size, technology, and maintenance
and safety requirements of the new battery.
Always use maintenance-free batteries
according to the TL82506 and VW75073
standards. These standards must be from
October 2014 or later.
The degassing tube must always be connec-
ted to the hole on the negative pole side and
the hole on the positive pole side must be
sealed.
The vehicle’s 12V battery must always be re-
placed by a qualified specialist company, as
the vehicle’s electronics must be adapted
during replacement. In addition, the battery
parameters for functional safety have been
determined based on the original battery.
Only a qualified specialist company has the
right technology to fit the correct replace-
ment battery.
The use of unsuitable batteries could inva-
lidate the vehicle registration certificate.
Start-Stop systems (
page 217 ) are equip-
ped with a special battery. Therefore, it must
only be replaced with a battery of the same
specifications.
Your vehicle is equipped with an intelligent
power management system to control the
distribution of electrical energy
page 330 .
The power management function ensures
that the battery is charged much more effi-
ciently than on vehicles without a power
management system. To maintain this func-
tion after replacing the battery, we recom-
mend that the replacement battery used is
of the same make and type as the original fit-
ted battery. To make proper use of the power
management function after the battery has
been changed, have the battery coded to
the power management mode at a special-
ised workshop.
WARNING
Always use only maintenance free batter-
ies that do not run flat alone and whose
properties, specifications and size corre-
spond to the standard battery. The specifi-
cations are indicated on the battery case.
Before starting any work on the batteries,
you must read and observe the warnings
in General information on page 327.
For the sake of the environment
Batteries contain toxic substances such
as sulphuric acid and lead. They must be
disposed of appropriately and must not be
disposed of with ordinary household waste.
Energy management
Optimisation of the starting ca-
pacity
The power management controls the distri-
bution of electrical energy and thus helps to
ensure that there is always enough power
available to start the engine.
If a vehicle with a conventional electrical sys-
tem is left parked for a long time, the battery
will gradually lose its charge because certain
electrical devices, such as the electronic
gearbox lock continues to draw current even
when the ignition is off. In some cases there
may not be enough power available to start
the engine.
Your vehicle is equipped with an intelligent
power management system to control the
distribution of electrical energy. This signifi-
cantly improves reliability when starting the
engine, and also prolongs the useful life of
the battery.
The main functions incorporated in the pow-
er management system are battery diagno-
sis, residual current management and dy-
namic power management.
Battery diagnosis
The battery diagnosis function constantly
registers the condition of the battery.
330
332


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