🔋 Battery Lifespan Calculator
Enter your battery's rated cycles, how often you cycle it, and your typical depth of discharge to estimate its effective cycle life and how many years it should last.
🔋 Estimate Battery Lifespan
What is a Battery Lifespan Calculator?
A battery lifespan calculator estimates how long a rechargeable pack — solar storage, an EV, or a power station — will last before it reaches end-of-life capacity. It adjusts the manufacturer's rated cycle count for how deeply you discharge, then converts cycles into calendar years.
Enter rated cycles, weekly cycling, and depth of discharge to see effective cycles and estimated years. Shallower cycling extends life and deep discharges shorten it — these are estimates for planning, not a warranty figure.
❓ Frequently Asked Questions
How does depth of discharge affect battery lifespan?
Cycling a battery shallowly is far gentler than draining it fully. Compared with the 80% baseline, discharging only to 50% can nearly double the cycles a pack delivers, while routinely running it to 100% can cut them by roughly 40%. This calculator applies that trade-off to your rated cycle count.
What are effective cycles versus rated cycles?
Rated cycles are the manufacturer's figure at a reference depth of discharge (usually 80%). Effective cycles adjust that for how you actually use the battery — shallower discharge yields more effective cycles, deeper discharge fewer — giving a more realistic basis for estimating real-world life.
How are the estimated years calculated?
The calculator divides your effective cycle count by how many cycles you run per week to get total weeks of life, then divides by 52 for years. A 3,000-cycle pack cycled once a day lasts roughly 8 years before reaching its rated end-of-life capacity.
Are these lifespan estimates exact?
No — they are estimates for planning, not a manufacturer warranty figure. Real lifespan also depends on temperature, charge and discharge rates, calendar ageing, and how the battery management system protects the pack. Use the result to compare usage patterns, not as a guarantee.