Enter the total battery capacity in amp hours and the energy usage in watts to calculate the total battery run time.

## Battery Run Time Formula

The following equation is used to calculate the total run time of a battery.

T = 10 * a / w

- Where T is the time in hours
- a is the amp hours (battery capacity)
- w is the power output/usage

## Example

The following is an example of how to calculate a total battery run time.

- First, determine the battery capacity. This is the total energy storage the battery can hold in amp hours. For this example we will say that value is 100 Ah.
- Next, determine the power output. This power output is also know as the usage rate and is measure in watts. We will say 50 watts for this problem.
- Finally, use the formula to calculate battery run time. 10 * 100 /50 = 20 hours.

## FAQ

**What is battery run time?**

Battery run time is the total amount of time a battery can sustain a certain power output. This run time will depends on several factors including discharge %, battery size, type of batter, and many more.

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