power test
Battery Runtime Calculator
Estimate a practical planning runtime without pretending nominal watt-hours are fully usable.
No accountLocal where possibleRetest anytime
Battery runtime
Estimate a practical planning runtime without pretending nominal watt-hours are fully usable.
This is a planning/compatibility calculation from the values you enter. DeviceOK does not claim to read charger protocols, battery health, cable electronics or mount certification from your browser.
Private by design
Calculated locally.
Use the result as evidence, not a guess.
This test checks
- Battery Wh
- Average load
- Efficiency allowance
How to read it
Real runtime depends on load shape, temperature, battery age and cutoff behavior.