Electrolyte level too low

WARNING: This page is about a different variant/trim than selected.

Fill with distilled water using battery filling bottle VAS 5045 (or equivalent) up to the max. marking

NOTE:

Design of filler support on filling bottle VAS 5045 prevents overfilling of battery cells and subsequent electrolyte leaks. When max. level is reached the flow of distilled water into battery cells stops.

Fig 1: VAS 5045 Battery Filling Bottle

Courtesy of VOLKSWAGEN UNITED STATES, INC.

CAUTION:

Only use distilled water to top-up batteries. This prevents electrolyte impurities which cause self-discharging.
DO NOT overfill the battery
Overfilled batteries can boil over.
Too little electrolyte reduces the service life of the battery.

Use of genuine VW battery cell caps ensures the different battery cover systems are sealed correctly. Only use genuine cell caps of the same construction if lost or damaged. All cell caps must be equipped with an O-ring seal.

NOTE: If it becomes necessary to top up the battery with distilled water, always perform battery test afterwards. Refer to Battery, testing .