Smart grid and lead–acid battery: what they have in common

1. Step 1. Smart grid — evolved from — Electrical grid. A digital grid.
2. Step 2. Electrical grid — is used in — Data centre. Power.
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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