Enter the battery capacity and the charge rate current into the calculator to determine the total time to charge to 100%.

Battery Charge Formula

The following equation is used to calculate the battery charge time to 100% from 0%.

T = C/R

  • Where T is the total time hours
  • C is the capacity in mAH
  • R is the rate in mA

Battery Charge Definition

A battery charge is defined as the total amount of time it takes a battery to charge from 0 to 100% or near 100%.

Battery Charge Example

How to calculate battery charge time?

  1. First, determine the total capacity.

    Calculate the total capacity of the battery.

  2. Next, determine the charge rate.

    Calculate the average rate of charge.

  3. Finally, calculate the time.

    Calculate the charge time using the equation above.


How long does it take to charge a battery?

The time it takes to charge a battery depends on the current being used to charge and the total size of the battery.

What is a battery capacity?

A battery capacity is the total amount of electrical energy a batter can hold when charged.

battery charge calculator
battery charge formula