Volkswagen Touran Service 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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