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

1. Step 1. Compressor — is part of — Air conditioner. A compressor.
2. Step 2. Air conditioner — is part of — Data centre. Cooling.
3. Step 3. Data centre — has part — Uninterruptible power supply. Backup power.
4. Step 4. Uninterruptible power supply — has part — Lead–acid battery. A battery.

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