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Battery Life CalculatorThis online battery life calculator allows you to estimate how long a battery will last in ideal conditions, based on nominal battery capacity and the device consumption (load current). This tool allows to specify battery capacity in Amp-hours (Ah) or milliamp-hours (mAh). The device consumption can be specified in Ampere (A) or milliampere (mA). Battery life formula: Battery life = Battery Capacity / Device Consumption To estimate the approximate number of charges your external battery pack can provide to your mobile device use our online Power Bank Calculator. Frequently Asked QuestionsWhat factors can affect real battery life?Actual battery life can differ from calculated results due to:
Can I use this calculator for any battery type? Yes, it works for most battery chemistries such as Li-ion, NiMH, Lead Acid, or Alkaline, as long as you know the nominal capacity.
How accurate are the results? The battery life calculator gives an approximate estimate. Real-world results can vary by 10–30% depending on usage patterns and environmental conditions. For precise engineering calculations, always test under actual load conditions.
What is the difference between nominal and actual battery capacity?
Why does my battery drain faster than calculated? Your device may draw more current intermittently (e.g., wireless modules, displays, motors). Also, real batteries lose efficiency under high loads or low temperatures.
Can I calculate battery life for variable loads? Yes. If your device’s current draw changes (e.g., sleep vs. active mode), calculate for each mode separately and average based on duty cycle or time spent in each state.
Does voltage affect battery life? Indirectly, yes. As voltage drops during discharge, many devices stop functioning before the battery is completely empty. This is called the cut-off voltage, and it shortens effective battery life.
Can I use battery life calculator for solar-powered or rechargeable systems? Yes, but keep in mind you’ll need to include charging cycles, solar input, and energy storage losses in your overall power budget for a realistic estimate.
How to extend battery life?
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