Audi 80 Quiz
Body Electrical System

Reserve Capacity

In this manual: Body Electrical System
Technical Description — 39Engines — 41Exhaust System — 13Cooling System — 28Fuel tank and fuel pump — 12Air Filter and Intake Ducts — 13Mono-Motronic Injection System — 18Digifant Injection System — 19KE-III-Jetronic Injection System — 35MPI and MPFI Injection Systems — 32Clutch — 11Transmission and Driveline — 21Suspension and Steering — 33Brake System — 41Anti-lock brake system — 8Wheels and Tires — 13Body Electrical System — 35Ignition System — 24Lighting — 14Signaling Devices — 7Instruments and Auxiliary Equipment — 54Heating and Ventilation — 7Body Components — 18Troubleshooting — 6Specifications — 13
~1min read

The operating time of a power consumer running on battery current can be calculated using the following formula:

Operating time = battery capacity multiplied by vehicle electrical system voltage, divided by consumer power. In practice, however, you should never rely on the full battery capacity, but only on 1/2 to 2/3 of the nominal capacity. For example, the following operating times result:

Battery Parking lights, approx. Parking lights, approx. Hazard warning lights, approx.
40 Ah 35 hours 12 hours 3 hours
63 Ah 56 hours 19 hours 2 hours

Effect of Ambient Temperature on the Battery
Batteries react to cooling the more negatively, the less they are charged. Completely discharged batteries are so sensitive that in freezing temperatures they can even freeze and crack. If the battery is fully charged, it tolerates cold relatively well. Before the cold season, it is therefore recommended to check the state of discharge of older batteries.

Test yourself

A quick Audi 80 quiz: every answer comes with an explanation and a link to the manual page.