Battery Life of 3000 mAh at 200 mA
A 3000 mAh battery powering a 200 mA load at 80% efficiency lasts approximately 12 hours.
How to use this tool
- Enter battery capacity, average load current and derating efficiency in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your battery life and the full breakdown beneath it.
Calculate the runtime of a 3000 mAh smartphone or device battery under a 200 mA moderate load with realistic 80% efficiency derating.
Frequently asked questions
- Why use a derating efficiency?
- Manufacturers rate capacity at a slow discharge rate (C/20). At higher currents or in cold temperatures, actual capacity is lower. 70% is a conservative real-world rule for lithium-ion cells.
- How do I find my device's current draw?
- Check the datasheet. For variable loads take a weighted average: active current × active fraction + sleep current × sleep fraction.