VW Polo manuals

Volkswagen Polo Service & Repair Manual: Severely Discharged Batteries

  WARNING
Risk of injury. Follow all Warnings and Safety Precautions. Refer to → Chapter „Warnings and Safety Precautions“.
For a battery to be indicated as “severely discharged”, the resting voltage must be less than 11.6 V.
  WARNING
Batteries that have a light yellow visual indicator do not have to be tested or charged. Jump starting must not be used!
There is a risk of explosion during testing, charging or jump starting.
These batteries must be replaced.
  Caution
Severely discharged batteries freeze earlier.
Batteries that have been frozen must no longer be used.
  Note
Severely discharged batteries in vehicles must be replaced prior to delivery. Pre-existing damage cannot be ruled out.
Batteries which have not been used in driving operation for a long time, for example vehicles in storage, discharge themselves.
For severely discharged batteries, the electrolyte consists almost completely of water, because the acid portion has been greatly reduced.
Severely discharged batteries become sulfated, meaning all the battery plate surfaces become hardened.
The sulfating process may be largely reversed if a severely discharged battery is recharged immediately.
If the battery is not recharged, the plates will continue to harden, and the ability to accept a charge will decrease. This results in reduction of battery performance.
–  Check the battery resting voltage. Refer to → Chapter „Battery, Charging“.
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Fuses in the vehicle
Fig. 172 Dash panel on the driver side: fuse box cover Fig. 173 In the front left of the engine compartment: fuse box cover First read and observe the introductory information and safety warnings Fuses must always be replaced by a new fuse with the same amp rating (same colour and marki ...

Positive and earth jump lead connection points
Fig. 190 In the engine compartment: jump lead connection point, positive ⊕ First read and observe the introductory information and safety warnings The positive jump lead connection point is in the engine compartment. In order to establish a suitable earth connection, screw towing eye into ...

Checking
–  Turn off the ignition. –  Connect pressure gauge battery (A/C service station). –  Take pressure gauge readings. There are two possible results A and B.   &nbs ...

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