Battery With Visual Indicator

As the "visual indicator" is only located in a battery cell, only the battery electrolyte level for this battery cell can be checked.
The "visual indicator" -arrow- provides information about the fluid levels and the state of charge for the battery being checked.
Bubbles can build up under the "visual indicator" when the battery is charging and also while driving, causing the color displayed to be incorrect.

-- Loosen the bubbles under the "visual indicator" by lightly and carefully hitting the "visual indicator" -arrow- with the handle of a screwdriver.

Fig 1: Identifying "Magic Eye" On Battery

Courtesy of AUDI OF AMERICA, LLC

Read the battery electrolyte level present in the color display. Two different displays are possible:

Color display	Battery level
Black or green	Battery electrolyte level OK
Colorless or light yellow	Battery electrolyte level too low. Risk of explosion, do not check or charge the battery.

WARNING:

Risk of explosion by charging the battery with "visual indicator".

If the "visual indicator" is colorless or light yellow, do not check or charge the battery. Do not try to jump start it! There is a risk of explosion when checking, charging, or jumping the battery. The battery must be replaced! Refer to BATTERY .