Batteries
Battery Cycle Life Calculator
Use Battery Cycle Life when estimated service years is the quantity you need. Enter rated cycles and cycles per year, then compare the answer with the equipment or operating limits that apply to your case.
Inputs for this calculation
Keep every entry on the units shown below.
Changing Rated cycles
Change Rated cycles from 2000 cycles to 2400 cycles while preserving the other measurements. The output changes from 6.67 years to 8.00 years.
Use a separate scenario when multiple conditions change together.
Understanding the equation
Here, Estimated service years is obtained from years = cycles ÷ annual cycles. Only Rated cycles and Cycles per year enter the numerical result.
The defaults produce 6.67 years. Replace them with measurements from one operating state.
Calculate estimated service years from rated cycles and cycles per year. Another relevant worksheet is Peukert Battery Runtime Calculator.
Values this page needs
Separate nameplate capacity from measured usable capacity. If operating conditions changed between readings, calculate separate cases.
At least one field has a positive lower bound because it appears in a denominator. A prefix error can move the result by several orders of magnitude. If you also need annual standby cost, continue with Standby Power Cost Calculator.
- Rated cycles
- Default example: 2000 cycles. Enter rated cycles in cycles.
- Cycles per year
- Default example: 300 cycles/year. Enter cycles per year in cycles/year.
Interpreting the answer
The primary answer, Estimated service years, describes only the entered scenario. Compare it with a warm, cold, new, and aged battery case where relevant.
Save the raw entries before testing another scenario.
Transferring the result
Archive rated cycles and cycles per year with estimated service years. Identify the instrument, rating, or assumption behind each entry.
Carry estimated service years before applying any display rounding. Keep a separate displayed value if reporting precision differs.
Where this estimate can fail
Calendar aging may end service before the cycle count.
The arithmetic intentionally leaves out chemistry-specific limits and manufacturer test conditions. Resolve material omissions before selecting a standard size or rating.
Separate nameplate capacity from measured usable capacity.
Questions from practical use
Does Battery Cycle Life Calculator choose a final rating?
Use the number as one check, then review a warm, cold, new, and aged battery case where relevant.
When should I round estimated service years?
Keep full precision while transferring estimated service years; round only at the final reporting or selection step.
What happens when a denominator is zero?
Use a measured positive value for Cycles per year; zero cannot stand in for missing data.
How should I prepare the Battery Cycle Life inputs?
Use rated cycles and cycles per year from one operating condition. Separate nameplate capacity from measured usable capacity.
What is not captured by this equation?
Calendar aging may end service before the cycle count. Also consider temperature, cell imbalance, BMS cutoffs, aging, and rate dependence.