Terms of Use

Last updated November 10, 2026

By using Battery Runtime Calculator you agree to these terms. If you do not agree, please do not use the site.

Estimates only

The calculators give estimates based on the values you enter and on typical battery behaviour described on how battery runtime is calculated. Actual runtime and sizing depend on the specific battery, inverter, temperature, age, wiring and load. Results are not a guarantee of performance and are not professional electrical, engineering or safety advice.

Check before you buy or install

Confirm capacities, discharge limits, charging requirements and safety ratings with the manufacturers’ datasheets before buying or installing equipment. Battery and electrical installations can be dangerous; follow local codes and use a qualified installer where required.

Medical and critical equipment

Do not rely solely on these estimates to plan backup power for medical devices such as CPAP machines or oxygen concentrators, or for any equipment where a power failure could cause harm. Test your setup and keep a margin well beyond the estimate.

No warranty

The site is provided “as is”, without warranties of any kind. We work to keep the calculators and content accurate but do not guarantee that they are error-free or always available. To the fullest extent permitted by law, we are not liable for any loss or damage arising from use of the site.

Using our content

You are welcome to link to any page and to quote short passages with a link back. Please do not copy the site or its calculators wholesale.

Changes

We may update these terms; the date at the top shows the latest version. Questions: hello@batteryruntimecalculator.com.