Battery Charge Time Calculator

Calculate the time required to charge a battery based on its capacity and the charging current.

Input Parameters

Calculation Results

Calculation Formula

Charge Time = Battery Capacity (mAh) / Charging Current (mA)

Where:
- Battery Capacity (mAh): Total energy storage of the battery in milliampere-hours
- Charging Current (mA): Rate at which the battery is being charged in milliamperes

Battery Charge Time Calculator Calculator Usage Guide

Learn how to use the Battery Charge Time Calculator and its working principles

How to Use the Calculator

  1. Enter the Battery Capacity in milliampere-hours (mAh). This is typically found on the battery label.
  2. Enter the Charging Current in milliamperes (mA). This is the current provided by your charger.
  3. Click the Calculate button to compute the charge time.
  4. The results will be displayed in both hours and minutes.

Understanding the Formula

The calculator uses the simple formula:

Charge Time (hours) = Battery Capacity (mAh) / Charging Current (mA)

This formula assumes 100% charging efficiency. In real-world scenarios, charging efficiency might be lower due to factors like internal resistance and temperature effects, so the actual charging time may be longer.

Example Calculation

For a battery with a capacity of 3000 mAh and a charger providing 1500 mA:

Charge Time = 3000 mAh / 1500 mA = 2 hours

This means the battery will be fully charged in 2 hours.

Important Notes

  • The calculator provides an estimate based on ideal conditions.
  • Real charging time may vary due to battery health, temperature, charger efficiency, and other factors.
  • For lithium-ion batteries, charging typically stops when the battery reaches 80-90% capacity to prevent overcharging.