VRLA / AGM Lead-Acid Cycle Life Calculator
Cycle life and service years for VRLA / AGM Lead-Acid at your depth of discharge and cycling rate (rated 500 cycles).
Sealed lead-acid is cheap and safe but shallow — design around 50% DoD and expect ~500 cycles; float life, not cycles, kills standby units. Enter your real depth of discharge and cycles per day: the tool applies the DoD inverse-power law to the 500-cycle datasheet rating and tells you whether cycling or calendar aging will retire the battery first.
Cycle life scales as (rated DoD ÷ your DoD)^1.4 for Lead-acid (VRLA/AGM). Whichever of cycling wear or calendar aging hits 80% first sets the real service life — lightly-cycled packs die of old age, hard-cycled packs die of throughput.
Engineering estimate from published standards and typical equipment data. Site conditions, equipment datasheets and measured data govern the real result — confirm with a qualified engineer.
Use the free VRLA / AGM Lead-Acid Cycle Life Calculator online — Cycle life and service years for VRLA / AGM Lead-Acid at your depth of discharge and cycling rate (rated 500 cycles). Runs instantly in your browser: no signup, no upload, mobile-friendly.
About VRLA / AGM Lead-Acid Cycle Life Calculator
Sealed lead-acid is cheap and safe but shallow — design around 50% DoD and expect ~500 cycles; float life, not cycles, kills standby units. Enter your real depth of discharge and cycles per day: the tool applies the DoD inverse-power law to the 500-cycle datasheet rating and tells you whether cycling or calendar aging will retire the battery first.
How to use VRLA / AGM Lead-Acid Cycle Life Calculator
- 1Pick the chemistry (or keep the application's default).
- 2Enter your typical depth of discharge and cycles per day.
- 3Read expected cycles, service years, and which aging mechanism retires the battery.
Why use VRLA / AGM Lead-Acid Cycle Life Calculator?
- ✓DoD inverse-power law — the actual shape of manufacturer cycle-life curves
- ✓Shows the binding constraint: cycling wear vs calendar aging
- ✓Energy-throughput output for warranty and TCO comparisons
- ✓All chemistries, one tool — compare LFP vs lead vs flow in seconds
Frequently asked questions
How does depth of discharge change battery cycle life?+
By a power law: halving DoD roughly triples Li-ion cycle count. An NMC pack rated 2,000 cycles at 85% DoD delivers ~5,500 cycles at 50%. This is why oversizing a battery (cycling it shallower) often costs less per delivered kWh over a decade.
Why might my battery die of old age before cycle wear?+
Calendar aging runs regardless of use — typically 1.5–2.5%/yr for Li-ion, worse when hot or stored full. A lightly-cycled backup battery (0.1 cycles/day) hits 80% from calendar fade in 8–13 years no matter how few cycles it saw. The tool shows which clock runs out first for your duty.
Which battery chemistry lasts longest?+
By cycle count: LTO (15,000+) and vanadium flow (12,000+, DoD-insensitive) lead; LFP (3,000–6,000) is the practical champion for cost; NMC/NCA (1,500–2,500) trade life for energy density; lead-acid (400–1,200) trails but is cheap upfront. Match chemistry to your cycling intensity.
What is energy throughput and why do warranties cap it?+
Throughput = capacity × DoD × cycles — the total energy a battery moves over its life. Warranties increasingly cap MWh throughput because it captures wear better than years or cycle counts alone. Compare price ÷ throughput across chemistries for the honest cost-per-kWh-delivered.
Embed VRLA / AGM Lead-Acid Cycle Life Calculator on your website
Want VRLA / AGM Lead-Acid Cycle Life Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/agm-battery-cycle-life-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="VRLA / AGM Lead-Acid Cycle Life Calculator — ToolJolt" loading="lazy"></iframe>Related Energy tools
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