Theremin and lead–acid battery: what they have in common

1. Step 1. Theremin — has part — Oscillator. Beat-frequency oscillators.
2. Step 2. Oscillator — is part of — Pacemaker. A pulse generator.
3. Step 3. Pacemaker — has part — Lithium-ion battery. A lithium battery (lithium–iodine).
4. Step 4. 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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