Interlinked metal rings and lead–acid battery: what they have in common

1. Step 1. Interlinked metal rings — is part of — Chain mail. Thousands of interlinked rings.
2. Step 2. Chain mail — works like — Roller chain. Interlinked links — a flexible metal structure.
3. Step 3. Roller chain — is part of — Electric bicycle. The chain drive from the pedals remains.
4. Step 4. Electric bicycle — has part — Lithium-ion battery. A battery.
5. Step 5. Lithium-ion battery — evolved from — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.

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