Lithium Battery Run Time Calculator



Calculating the run time of lithium batteries is crucial for optimizing power consumption in various devices. The Lithium Battery Run Time Calculator provides a simple yet effective tool to estimate how long a lithium battery will last under specific conditions.

How to Use

  1. Input the battery capacity in ampere-hours (Ah).
  2. Enter the current draw in amperes (A).
  3. Press the “Calculate” button to obtain the estimated run time.


The formula for calculating run time (in hours) is:


Suppose you have a lithium battery with a capacity of 2000mAh (or 2Ah) and a device drawing a current of 0.5A. Using the formula:


Q: Can I use this calculator for other types of batteries?

A: No, this calculator is specifically designed for lithium batteries.

Q: What if my device has variable current draw?

A: For variable current draw, use an average or estimate based on the device’s typical usage.

Q: Is the calculation accurate for all lithium battery chemistries?

A: Yes, the formula is a general approximation for common lithium battery chemistries like Li-ion and Li-poly.

Q: Can I use this calculator for non-electronic devices?

A: No, this calculator is intended for electronic devices powered by lithium batteries.


The Lithium Battery Run Time Calculator is a handy tool for individuals and engineers working with lithium-powered devices. By inputting the battery capacity and current draw, users can quickly estimate how long their devices will run on a single charge. This information is valuable for planning and optimizing power usage.

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