Volkswagen Passat 1995 Official Factory Repair Manual page 4306

Work descriptions
Observe disposal regulations!
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- Screw in battery sealing plugs.
Checking battery / batteries with magic eye and
without battery cell plugs
These batteries can be recognized by "magic eye" - 1 - and
a cover - 2 - (as shown in illustration).
Note:
"magic eye" can be located at various positions on
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battery.
Caution!
Cover is used only for filling during production. Cover
must not be removed under any circumstances,
otherwise battery may be damaged. battery becomes
unusable.
magic eye gives information regarding acid level and
charge level of battery.
- Before performing a visual check, lightly and carefully tap
onto magic eye using a screwdriver handle.
Air bubbles, which can affect display, are dispersed by
doing this.
Reading colored display of "magic eye" will therefore be
more accurate. Three different color indications are
possible:
- Green battery is sufficiently charged.
- Black no charge or charge too low, battery must be
charged (repair measure).
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12/7/2004