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ThroughputEoW capacityDegradationTerms
Battery Warranty and Cycle Life Explained
Warranties hide important limits in their definitions. Throughput, end-of-warranty capacity, and degradation terms decide real value.
01Introduction
What this article covers
A storage warranty is more than a year count. The useful protection lives in how throughput, end-of-warranty capacity, and degradation are defined — and those definitions vary widely between products.
02Technical
Throughput limits
Many warranties cap energy throughput (MWh delivered) over the term. A site that cycles hard can hit the throughput limit before the calendar years expire, so model your annual throughput against the cap.
03Technical
End-of-warranty capacity
Warranties often guarantee a minimum remaining capacity (for example 70–80%) at the end of the term. That number, not the calendar length, describes how much useful energy you keep.
04Technical
Degradation assumptions
Warranty terms assume a duty — depth of discharge, temperature, rate. Operate outside those assumptions and protection may not apply. Match the assumed duty to your real one before relying on the guarantee.
05Technical
What to compare
Compare warranties on like-for-like terms: same depth of discharge, same climate, same throughput. The headline year count means little without the operating envelope attached to it.
06Related Products
Products referenced
Referenced in this article
Commercial & Industrial ESS
C&I systems with documented warranty terms.
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Battery Storage Components
Cells and modules with spec-level warranties.
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10FAQ
Frequently Asked Questions
What does end-of-warranty capacity mean?
It is the minimum usable capacity the manufacturer guarantees at the end of the term — the real measure of kept energy.
Why does throughput matter?
Throughput caps total energy delivered; a heavily cycled site can exhaust the warranty on energy before the years run out.
Are warranty years the whole story?
No. The operating assumptions (depth, temperature, rate) decide whether the guarantee actually applies to your duty.
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