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Home >> Audi >> 2017 >> A3 Premium, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Charging System (Battery, Starter, Generator) & Cruise Control -- (A3 Sedan) (Battery & Charging)) >> 27 Starter, Generator And Cruise Control >> Battery, Charging >> Severely Discharged Batteries >> Notes

Severely Discharged Batteries: Notes

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.