SuperCalX

Battery Life Calculator

Estimate how long a battery will last under a specific load.
Calculator
Enter your values
Analysis
Interpretation of the current calculator output

Enter values to see detailed analysis and insights.

How to Use

Step-by-step instructions
  1. 1Enter the battery capacity (mAh).
  2. 2Enter the device current consumption (mA).
  3. 3The calculator will estimate the runtime.

Runtime Estimation

Divides the battery capacity (mAh) by the device consumption (mA) and applies an efficiency factor (typically 0.85) to account for losses.
Time = (Capacity / Load) × Efficiency

Variables:

CapacityBattery capacity in mAh
LoadCurrent draw in mA
Efficiency0.85 (Typical)

Example

IoT Device

Inputs:

Capacity:2500 mAh
Load:500 mA

Steps:

  1. 1.Ideal = 2500 / 500 = 5 hours
  2. 2.Estimated = 5 * 0.85 = 4.25 hours
Result:
4.3 Hours

Frequently Asked Questions

Why is real life shorter?

Batteries lose efficiency at higher discharge rates, extreme temperatures, and as they age. Voltage drop also affects usable capacity.