Cash register and voltaic pile: what they have in common

1. Step 1. Cash register — evolved into — Self-checkout. A till.
2. Step 2. Self-checkout — has part — Touch layer (capacitive). A touchscreen.
3. Step 3. Touch layer (capacitive) — is part of — Smartwatch. A touchscreen.
4. Step 4. Smartwatch — has part — Lithium-ion battery. Powered by a lithium-ion 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.
6. Step 6. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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