Operating time = battery capacity multiplied by the on-board voltage and divided by the consumer power. In practice, however, you should never count on the full capacity of the battery, but only up to ⅔ of the nominal capacity. This results in, for example, the following operating times:
If the Audi 100 is equipped with a dust filter (from 8/92) or air conditioning, the battery is located on the right under the rear seat. On all other vehicles, it is located, as shown here, in the so-called waterproof housing under the shell on the right rear in the engine compartment. To remove the battery, first disconnect the negative terminal (1), then the positive terminal (2). Do not forget about the ventilation hose for removing gases on the battery housing. Now you can loosen the screw (3) on the bracket at the base of the battery.
The effect of ambient temperature on the battery
Batteries have the property of reacting to cooling more negatively, the less they are charged. Completely discharged batteries are so sensitive that in frost they can even freeze and burst. If the battery, on the contrary, is fully charged, it tolerates cold relatively well. Therefore, before the onset of cold weather, it is recommended to check the degree of discharge on old batteries.
(The original article is posted on the resource «Audimanual.ru»)