Calculator Says Batteries Are Low After Changing
Understanding when your batteries are low is crucial to prevent unexpected power loss. Our calculator helps you determine battery life based on capacity, discharge rate, and voltage.
- Enter the battery’s capacity in mAh.
- Enter the discharge rate in mA.
- Enter the battery’s voltage in V.
- Click “Calculate” to see the estimated battery life and a visual representation.
The calculator uses the formula: Battery Life (hours) = Battery Capacity (mAh) / Discharge Rate (mA). The result is then multiplied by the battery’s voltage to get the battery life in watt-hours.
| Battery Type | Capacity (mAh) | Discharge Rate (mA) | Voltage (V) | Estimated Life (hours) |
|---|
- Always use fresh batteries for optimal performance.
- Store batteries in a cool, dry place to prolong shelf life.
- Never mix old and new batteries in the same device.
What is the difference between mAh and mA?
mAh (milliampere-hour) is a measure of battery capacity, while mA (milliampere) is a measure of current. mAh = mA * h (hours).
For more information, see the U.S. Department of Energy’s Battery Life Calculator and the Battery University’s guide on calculating battery life.