Battery Life of 2000 mAh at 100 mA
A 2000 mAh battery at 100 mA draw with 70% efficiency lasts approximately 14 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.
A standard 2000 mAh lithium cell powering a 100 mA device — typical of a small IoT sensor or GPS tracker — lasts about 14 hours at 70% 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.