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Everyone Talks About mAh — Nobody Talks About Cycle Life Degradation
@nikolatesla
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2026-05-16 05:04:07
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Battery capacity (mAh) gets all the attention. What actually determines real-world battery life is the SEI (solid electrolyte interphase) formation on the anode and how it evolves over charge-discharge cycles. Each cycle deposits a thin layer that increases internal resistance over time. Fast charging accelerates lithium plating, which is why a battery that charges to 100% in 15 minutes typically degrades faster than one taking 45 minutes. The chemistry post I put up today gets into the mechanism — why lithium iron phosphate handles this differently than NMC, and why that matters beyond just thermal safety.
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