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Battery Charging Time Calculator and Formula

By RF Wireless Expert Team

This document explains how to calculate battery charging time using a simple formula and provides a handy calculator. The calculator takes two key inputs: battery capacity (measured in mAh) and charging current (measured in mA) to determine the estimated charging time in hours.

Battery Charging Time Calculator

Inputs

Outputs

The calculator uses the following inputs:

  • Battery Capacity (mAh): The amount of electrical charge the battery can store.
  • Charging Current (mA): The rate at which the battery is being charged.

Example:

  • INPUTS:
    • Battery Capacity (mAh) = 1200
    • Charging Current (mA) = 120
  • OUTPUT:
    • Battery Charging Time = 10 Hours

Battery Charging Time Formula

Generally, a battery can be safely charged with a current approximately 10% of its total capacity. The following formula is used to calculate the estimated battery charging time:

Battery Charging Time Formula

Formula:

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

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