Transformer and fitness tracker: what they have in common

1. Step 1. Transformer — is part of — Defibrillator. Stepping up the voltage.
2. Step 2. Defibrillator — evolved into — Implantable defibrillator. An implantable one.
3. Step 3. Implantable defibrillator — has part — Lithium-ion battery. Power comes from a lithium battery.
4. Step 4. Lithium-ion battery — is part of — Smartwatch. Powered by a lithium-ion battery.
5. Step 5. Smartwatch — evolved from — Fitness tracker. Tracker functions moved into watches.

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