Energy
A battery ages even when you never use it. The reason is a film a few nanometres thick
1 Sept 2026 · 12 min read
A lithium-ion cell loses capacity on a shelf, not only in a pocket. The reason is a layer that forms on the anode during the very first charge, keeps growing for the rest of the battery's life, and quietly eats lithium the whole time. Understanding it explains almost every piece of battery advice that actually works.
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