Battery Life Calculator
Run the Battery Life Calculator MicroSim
About This MicroSim
This battery life calculator estimates how long a battery will last, based on nominal battery capacity and the average current that a load is drawing from it. Battery capacity is typically measured in Amp-hours (Ah) or milliamp-hours (mAh), although Watt-hours (Wh) is occasionally used.
The formula is simple:
\[\text{Hours} = \frac{\text{Capacity (mAh)}}{\text{Current (mA)}}\]
You can convert Watt-hours to Amp-hours by dividing by the battery's nominal voltage (V):
\[\text{Ah} = \frac{\text{Wh}}{\text{V}}\]
Battery Options
| Battery | Capacity |
|---|---|
| CR2032 Coin Cell | 220 mAh |
| 2x AAA Alkaline | 2,400 mAh |
| 4x AA Alkaline | 10,000 mAh |
| 9V Battery | 550 mAh |
| 18650 LiPo Cell | 3,000 mAh |
| Power Pack 10,000mAh | 10,000 mAh |
Device Options
| Device | Current Draw |
|---|---|
| Dim Red LED | 2 mA |
| Bright White LED | 20 mA |
| 30 RGB LED Strip (10% brightness) | 180 mA |
| 8x8 RGB LED Matrix (80% brightness) | 1,024 mA |
Key Features
- Select from common battery types or enter custom capacity
- Select from common devices or enter custom current draw
- Visual battery representation with color-coded duration
- Automatic time unit conversion (minutes, hours, days, weeks, years)