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Battery Life Calculator
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This 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
Frequently Asked Questions
What factors can affect real battery life?
What factors can affect real battery life? |
Actual battery life can differ from calculated results due to:
- Battery age and quality
- Temperature (extreme heat or cold reduces performance)
- Discharge rate (high current drains batteries faster)
- Device efficiency and power-saving modes
- Self-discharge of the battery over time
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Can I use this calculator for any battery type?
Can I use this calculator for any battery type? |
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Yes, it works for most battery chemistries such as Li-ion, NiMH, Lead Acid, or Alkaline, as long as you know the nominal capacity.
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How accurate are the results?
How accurate are the results? |
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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.
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What is the difference between nominal and actual battery capacity?
What is the difference between nominal and actual battery capacity? |
- Nominal battery capacity is the rated value provided by the manufacturer.
- Actual battery capacity decreases over time due to aging, temperature, and charge / discharge cycles.
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Why does my battery drain faster than calculated?
Why does my battery drain faster than calculated? |
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Your device may draw more current intermittently (e.g., wireless modules, displays, motors). Also, real batteries lose efficiency under high loads or low temperatures.
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Can I calculate battery life for variable loads?
Can I calculate battery life for variable loads? |
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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.
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Does voltage affect battery life?
Does voltage affect battery life? |
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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.
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Can I use battery life calculator for solar-powered or rechargeable systems?
Can I use battery life calculator for solar-powered or rechargeable systems? |
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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.
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How to extend battery life?
How to extend battery life? |
- Use energy-efficient components.
- Reduce standby current.
- Operate at moderate temperatures.
- Avoid deep discharges for rechargeable batteries.
- Use power management techniques like sleep modes.
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