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Home >> Audi >> 2017 >> TT Quattro Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 54 (Charging System (Battery, Starter, Generator) & Cruise Control (2 Of 2) [Coupe]) >> 27 Starter, Generator And Cruise Control >> Battery, Charging >> Severely Discharged Batteries

Severely Discharged Batteries

WARNING: This page is about a different variant/trim than selected.
WARNING:

Risk of injury. Follow all warning messages and safety precautions. Refer to WARNINGS AND SAFETY PRECAUTIONS .

A Battery -A- is designated as "severely discharged" if the resting voltage is less than 11.6 V.

WARNING:

Do not check or charge a Battery -A- when the visual indicator has >>no color or is bright yellow<<. Jump starting must not be used!

There is a risk of explosion during testing, charging or jump starting.

These Batteries -A- must be replaced.

CAUTION:
  • Severely discharged Batteries -A- freeze earlier.
  • Batteries -A- that have frozen must no longer be used.
NOTE:

Batteries -A- that have not been used for a long time will discharge by themselves.

In severely discharged Batteries -A-, the electrolyte consists almost completely of water, because the acid portion has been greatly reduced.

Severely discharged Batteries -A- become sulfated, meaning all of the plate surfaces of the Batteries -A- harden.

The sulfation process may be reversed if a severely discharged Battery -A- is recharged immediately.

If the Battery -A- 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.

Severely discharged Batteries -A- in vehicles must be replaced prior to delivery. Pre-existing damage cannot be ruled out.

Procedure 

-- Check the Battery -A- resting voltage. Refer to BATTERY, CHARGING .

-- Charge the Battery -A- :