What actually fails, what the warranty covers, and how to document a claim.
Common failure modes and their causes
Cell imbalance, water ingress, over-current and charger mismatch account for most failures we see.
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What the warranty covers and how to claim
A real warranty states capacity retention and cycle count, with a claim process and a response time.
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Questions
Short answers to the ones that come up most.
What usually kills a lithium pack?
Water ingress, an unmatched charger, and sustained over-current. Cell defects are rarer than installation mistakes.
What does a warranty cover?
Capacity retention within a cycle count, and cell failure — with the terms written down.
How do I document a claim?
Keep the BMS log, the purchase record and the delivered-capacity test from day one.
