Battery Life of 1500 mAh at 50 mA (IoT Device)
An IoT device drawing 50 mA from a 1500 mAh battery at 80% efficiency runs for approximately 24 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.
Many IoT sensors and remote nodes draw around 50 mA; a 1500 mAh AA-sized cell lasts roughly 24 hours under these conditions.
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.