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- Switch off ignition.
- Lay bare battery posts => Page
2
onwards.
- -> Unfasten nut -3- several turns and disconnect pole shoe of earth wire from battery post.
- If applicable, unscrew nut -1- and detach busbar for main fuse box at pole shoe of positive wire.
- Unfasten nut -2- several turns and disconnect pole shoe of positive wire from battery post.
- -> Connect positive lead of battery charger to positive terminal of battery.
- Connect negative lead of battery charger to negative terminal of battery.
- Set charging current on battery charger in line with battery capacity. It should be roughly 10 % of battery
capacity (i.e. for a 60 Ah battery approx. 6 A).
- Switch on battery charger.
Install in reverse order, paying attention to the following:
- Connect battery. Action to be taken => Page
7
.
Explanatory notes on exhausted batteries
Batteries which have not been used for lengthy periods, e.g. in vehicles which have not been driven, are subject
to self-discharge.
A battery is considered to be exhausted if the no-load voltage has dropped below 11.6 V.
Measuring no-load voltage => Page
13
With exhausted batteries, the electrolyte (mixture of sulphuric acid and water) is more or less all water, with a
greatly reduced sulphuric acid content.
At temperatures below zero, the battery may freeze and the casing burst.
Exhausted batteries become sulphated, i.e. all the plate surfaces of such batteries become hard. As opposed
to being clear, the electroyte has a slightly milky appearance.
If an exhausted battery is re-charged immediately after exhaustive discharge, the sulphation can be reversed.
Audi A3 1997 ➤
Electrical system - Edition 10.2003
18
27 - Starter, Current supply