Estimated battery life
Estimate runtime from capacity, average current and usable capacity.
Inputs
Calculations run in your browser. Your input values are not submitted or saved.
Results
- Estimated time
- 16 h
This is a linear estimate, not a guaranteed backup time. Temperature, ageing, discharge rate, cutoff voltage and converter consumption affect runtime.
Formula & guidance
hours = mAh × usable_fraction / mA
This is a linear estimate, not a guaranteed backup time. Temperature, ageing, discharge rate, cutoff voltage and converter consumption affect runtime.
Change the example inputs and check each field’s units. Use equipment datasheets and applicable project standards for final decisions. Results do not establish Canadian electrical-code compliance or certify a design.