The Battery Runtime Calculator helps you estimate how long your battery will last based on its capacity and the device's power consumption. Whether you're using an eBike, gadget, or appliance, this calculator gives a practical runtime estimate in hours and minutes, accounting for efficiency losses.
How Does Battery Runtime Work?
Battery runtime depends on the total energy stored in the battery (Wh) and the power drawn by the device (W). By dividing battery capacity by device load and adjusting for efficiency, you get an estimate of how long the battery will power your device before depletion.
- Battery energy is measured in Watt-hours (Wh)
- Device or motor power determines consumption rate
- Efficiency accounts for energy lost during discharge
- Runtime = (Battery Capacity × Efficiency) ÷ Device Power
Why Estimate Battery Runtime?
Understanding battery runtime is essential for planning trips, device usage, and avoiding unexpected power loss.
- Plan eBike trips without running out of battery
- Know how long gadgets will last on a single charge
- Estimate backup power duration for appliances
- Compare battery performance and efficiency
Tips for Accurate Runtime Estimates
- Include all loads and accessories consuming power
- Use realistic efficiency values (80–95%)
- Remember battery degradation reduces capacity over time
- Consider variable loads during operation
Frequently Asked Questions
Q: How is battery runtime calculated?
Divide the battery capacity (Wh) by the device's power consumption (W), then adjust for efficiency.
Q: Does efficiency affect runtime?
Yes. Higher efficiency means longer runtime. Typical battery systems operate at 80–95% efficiency.
Q: Can I use this calculator for any device?
Yes, it works for eBikes, gadgets, appliances, or any device with a known power draw.
Q: Will battery age impact runtime?
Yes, older batteries have lower effective capacity, reducing actual runtime.
Q: Is runtime the same as full charge duration?
No. Runtime calculates how long a charged battery lasts under load, not the charging time.
