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2. Backup battery - Wikipedia

   en.wikipedia.org/wiki/Backup_battery

   A backup battery provides power to a system when the primary source of power is unavailable. Backup batteries range from small single cells to retain clock time and date in computers, up to large battery room facilities that power uninterruptible power supply systems for large data centers. Small backup batteries may be primary cells ...

3. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   A large data-center-scale UPS being installed by electricians. An uninterruptible power supply (UPS) or uninterruptible power source is a type of continual power system that provides automated backup electric power to a load when the input power source or mains power fails.

4. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   Commonly used on computer motherboards as nonvolatile BIOS memory and real-time clock (RTC) backup batteries, device remote controls, remote key fobs for cars and other vehicles. Also in other devices such as key finders like Apple's AirTag .

5. Battery room - Wikipedia

   en.wikipedia.org/wiki/Battery_room

   Battery room. A battery room is a room that houses batteries for backup or uninterruptible power systems.The rooms are found in telecommunication central offices, and provide standby power for computing equipment in datacenters.

6. Lead–acid battery - Wikipedia

   en.wikipedia.org/wiki/Lead–acid_battery

   Wet cell stand-by (stationary) batteries designed for deep discharge are commonly used in large backup power supplies for telephone and computer centres, grid energy storage, and off-grid household electric power systems. [26] Lead–acid batteries are used in emergency lighting and to power sump pumps in case of power failure.

7. Lithium-ion battery - Wikipedia

   en.wikipedia.org/wiki/Lithium-ion_battery

   A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li + ions into electronically conducting solids to store energy. In comparison with other commercial rechargeable batteries, Li-ion batteries are characterized by higher specific energy, higher energy density, higher energy efficiency, a longer cycle life, and a longer calendar life.