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2. Spare part - Wikipedia

   en.wikipedia.org/wiki/Spare_part

   A spare part, spare, service part, repair part, or replacement part, is an interchangeable part that is kept in an inventory and used for the repair or refurbishment of defective equipment/units. Spare parts are an important feature of logistics engineering and supply chain management , often comprising dedicated spare parts management systems.

3. 18650 battery - Wikipedia

   en.wikipedia.org/wiki/18650_battery

   18650 battery cells are used in a wide variety of products from the 1990s through the 2020s, and are widely regarded as the most produced lithium-ion cell size. [ 10 ] 18650/1865 cells are used in many laptop computer batteries, cordless power tools, many electric cars, electric scooters, [ 11 ] most e-bikes , older portable powerbanks ...

4. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   The full battery designation identifies not only the size, shape and terminal layout of the battery but also the chemistry (and therefore the voltage per cell) and the number of cells in the battery. For example, a CR123 battery is always LiMnO 2 ('Lithium') chemistry, in addition to its unique size.

5. HP Essential - Wikipedia

   en.wikipedia.org/wiki/HP_Essential

   HP Essential was a trademark used by Hewlett-Packard (later HP Inc.) to denote their entry-level, inexpensive laptops using the Microsoft Windows operating system, produced from 2009 to 2024. Products under the "Essential" moniker include the HP Laptop series [ 1 ] and HP Notebook series, as well as products simply branded as "HP".

6. Mercury battery - Wikipedia

   en.wikipedia.org/wiki/Mercury_battery

   Mercury battery "РЦ-53М"(RTs-53M), Russian manufactured in 1989. A mercury battery (also called mercuric oxide battery, mercury cell, button cell, or Ruben-Mallory [1]) is a non-rechargeable electrochemical battery, a primary cell. Mercury batteries use a reaction between mercuric oxide and zinc electrodes in an alkaline electrolyte.

7. Primary battery - Wikipedia

   en.wikipedia.org/wiki/Primary_battery

   A variety of standard sizes of primary cells. From left: 4.5V multicell battery, D, C, AA, AAA, AAAA, A23, 9V multicell battery, (top) LR44, (bottom) CR2032 A primary battery or primary cell is a battery (a galvanic cell) that is designed to be used once and discarded, and it is not rechargeable unlike a secondary cell (rechargeable battery).