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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Charging System (Battery, Starter And Generator) & Cruise Control (2 Of 2) >> 27 Starter, Generator And Cruise Control >> Battery >> Battery Types >> AGM-Battery

Battery Types: AGM-Battery

CAUTION:

The following described Batteries -A- are maintenance-free Batteries -A-. Do not remove any of the labels on the battery and do not add distilled water. Perform only a visual inspection. Note the service information on battery testing. Refer to BATTERY, CHECKING .

Maintenance-Free Battery -A- with Fixed Electrolyte (AGM battery).

Lead-acid battery, where the electrolyte is fixed in an absorbent glass mat (AGM). The Battery -A- is closed and equipped with breather valves.

"AGM" is the English abbreviation for Absorbent Glass Mat.

These Batteries -A- cannot have a visual indicator due to the fixed electrolyte. AGM is on the Battery -A- to identify it.

When replacing an AGM battery, another AGM battery must be installed.