power test
Power Bank Charge Count Calculator
Compare power-bank energy with the device battery's energy rather than comparing mAh values at different voltages.
No accountLocal where possibleRetest anytime
Power-bank charges
Compare power-bank energy with the device battery's energy rather than comparing mAh values at different voltages.
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
All values stay in your browser.
Use the result as evidence, not a guess.
This test checks
- Power-bank energy
- Device battery energy
- Conversion efficiency
How to read it
Actual usable energy changes with voltage conversion, cable loss, temperature and cutoff behavior.
A full-equivalent charge estimate is not a promise of exact real-world charges.