Battery Life of 10000 mAh at 1000 mA
A 10,000 mAh power bank delivering 1000 mA at 70% efficiency provides approximately 7 hours of runtime.
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.
Large 10,000 mAh power banks are popular for charging phones and tablets; at 1 A output with typical conversion losses, expect about 7 hours.
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.