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2. Sump pump - Wikipedia

   en.wikipedia.org/wiki/Sump_pump

   Alternative sump pump systems can be driven by municipal water pressure. Water-powered ejector pumps have a separate pump, float and check valve. [4] The float controlling a backup pump is mounted in the sump pit above the normal high water mark. Under normal conditions, the main electric powered sump pump will handle all the pumping duties.

3. Lithium metal battery - Wikipedia

   en.wikipedia.org/wiki/Lithium_metal_battery

   CR2032 lithium button cell battery Lithium 9 volt, AA, and AAA sizes. The top object is a battery of three lithium-manganese dioxide cells; the bottom two are lithium-iron disulfide cells and are compatible with 1.5-volt alkaline cells. Lithium metal batteries are primary batteries that have metallic lithium as an anode.

4. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threa­ded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.

5. Battery energy storage system - Wikipedia

   en.wikipedia.org/wiki/Battery_energy_storage_system

   Battery energy storage systems are generally designed to be able to output at their full rated power for several hours. Battery storage can be used for short-term peak power [2] and ancillary services, such as providing operating reserve and frequency control to minimize the chance of power outages. They are often installed at, or close to ...

6. Nonvolatile BIOS memory - Wikipedia

   en.wikipedia.org/wiki/Nonvolatile_BIOS_memory

   It is referred to as non-volatile memory or NVRAM because, after the system loses power, it does retain state by virtue of the CMOS battery. When the battery fails, BIOS settings are reset to their defaults. The battery can also be used to power a real time clock (RTC) and the RTC, NVRAM and battery may be integrated into a single component.

7. Button cell - Wikipedia

   en.wikipedia.org/wiki/Button_cell

   Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button.

8. Pumped-storage hydroelectricity - Wikipedia

   en.wikipedia.org/wiki/Pumped-storage...

   The Grand Coulee Dam in the United States was expanded with a pump-back system in 1973. [75] Existing dams may be repowered with reversing turbines thereby extending the length of time the plant can operate at capacity. Optionally a pump back powerhouse such as the Russell Dam (1992) may be added to a dam for increased generating capacity ...