The Audi-100 has a so-called maintenance-free battery that complies with DIN 72311 and has a relatively large water reserve. Under normal conditions, it should do without adding new distilled water for the entire service life. Increased water consumption is caused only by increased ambient temperature, long stays in hot regions (vacation), a defective alternator voltage regulator, self-discharge when the vehicle is parked for a long time, or a deep discharge caused, for example, by parking lights on all night.
The electrolyte in the battery must reach at least the lower mark on the case, applied with varnish or extruded, but at least well cover the upper edges of the plates.
If the fluid level is low, unscrew the plug.
If the battery is charged normally, then add distilled water to the upper mark or 15 mm above the upper edges of the plates.
If the battery is very discharged, then add only enough water to cover the plates on top, because. when recharging, the liquid level will rise significantly.
Top up to the upper mark only after charging.
The amount of water from the filling bottle must be well dosed because the accumulator is easy to overfill.
Overfilled battery «boils», the acid protrudes from the cork.
Removing the battery
Disable the anti-theft system and radio code so that they can be re-enabled after the battery is connected.
In vehicles without dust filter/air conditioner: black waterproof cover (rear in engine compartment) raise.
On vehicles with air conditioning/dust filter: Remove the rear seat by removing the two Phillips screws.
For everyone: be sure to disconnect the negative cable first to prevent a short circuit when working with the battery.
Loosen the nut on the negative wire terminal, disconnect the terminal from «-» output.
Loosen and remove the positive wire terminal.
Unscrew the bolts of the mounting plate at the bottom of the battery, remove the bolts and the plate.
Disconnect the plastic hose from the central gas outlet.
Take out the battery.
When installing, first connect the positive, then the negative wires.
It is almost impossible to mix up the wire terminals without applying force, because the positive terminal is thicker than the negative terminal.
Do not forget to connect the hose from the central gas outlet.
Turn on the alarm and radio again.
Caring for battery contacts
Wash the crystals on the battery terminals with warm water and soda or process «Neutralon» by Varta.
Lubricate wire leads and terminals with acid-proof grease («Ft 40v1» by Bosch).
Do not apply grease to the sides of the terminals and the inside of the terminals, otherwise problems with the contacts may occur.
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