Battery Life Calculator

Estimate how long your battery will last under a specific load.

Battery Efficiency (0.1 - 1.0)

Battery Capacity

mAh

Load Current

mA

Instructions

How to Use:

Enter Battery Capacity (e.g., 2000mAh, 5Ah).
Enter Load Current (how much current your device draws).
Adjust Efficiency if needed (default 0.85 accounts for real-world losses).
Click Calculate to see the estimated runtime.

Note: Actual battery life varies based on temperature, age, and discharge curve.