Volkswagen Passat 1995 Official Factory Repair Manual page 4305

Work descriptions
To avoid electrolyte impurities, which can increase self-
discharge of battery, only distilled water may be added to
increase acid level.
- Unscrew battery sealing plugs.
- Using battery fill bottle VAS 5045/ fill with distilled water up
to max.-marking.
Note:
Construction of filler tube of battery filler bottle VAS
n
5045/ prevents overfilling of battery cells and
escaping of battery acid. When max. fill level is
reached, inflow of distilled water into cells is
interrupted.
- Screw in battery sealing plugs.
Electrolyte level too high
Note:
If electrolyte level is too high (above max.-marking),
n
electrolyte (a mixture of sulfuric acid and water)
escapes and causes damage outside battery, for
example to functional parts in engine compartment.
- Unscrew battery sealing plugs.
At an acid level that is too high (overfilling), i.e. it lies above
inner acid level marking (plastic plug) or above exterior
max.-marking:
- Use hydrometer to extract off electrolyte until its level has
reached mark on plastic peg - 1 - or max. mark.
Note:
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.ME01.01.5
Page 75 of 83
12/7/2004