Battery Life (Runtime) Calculator
Calculate the battery runtime from capacity and current.
mAh
mA
%
Result
12 sa 45 dk
Estimated battery life: 12 hours 45 minutes
Result in all units
Step-by-step solution
What Is Battery Life?
Battery life shows how long a battery will last when a certain current is drawn. It depends on the battery capacity and the current the device draws.
How is it calculated?
How Is It Calculated?
Time (hours) = capacity (mAh) ÷ current (mA)
- Enter the battery capacity and the device current.
- The actual time is a bit shorter due to efficiency losses.
Frequently Asked Questions
How long does a 2000 mAh battery last in a 100 mA device?
Theoretically 2000 ÷ 100 = 20 hours; in practice a bit less due to efficiency.