Reserve Capacity

Reserve capacity is the maximum amount of time (in minutes) it will take for a fully charged battery, being discharged at a constant rate of 25 amperes with the temperature remaining at 27°C (80°F), to reach a terminal voltage of 10.5 volts.
^ Reserve capacity is an estimate of how long a person may operate the vehicle under the following conditions:
- No generator output
- The headlamps are on
- A minimum electrical load (most accessories are turned off).
^ How long the battery will actually last when the vehicle is being driven without generator output depends on the following factors:
- The temperature
- The current draw
- The state of charge
- The condition of the battery