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2. Nickel–hydrogen battery - Wikipedia

   en.wikipedia.org/wiki/Nickel–hydrogen_battery

   A nickel–hydrogen battery (NiH 2 or Ni–H 2) is a rechargeable electrochemical power source based on nickel and hydrogen. [5] It differs from a nickel–metal hydride (NiMH) battery by the use of hydrogen in gaseous form, stored in a pressurized cell at up to 1200 psi (82.7 bar) pressure. [6]

3. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   A common size for cells inside cordless tool battery packs. This size is also used in radio-controlled scale vehicle battery packs and some Soviet multimeters. 1 ⁄ 2-, 4 ⁄ 5 - and 5 ⁄ 4-sub-C sizes (differing in length) are also available. Soviet 332 type can be replaced with R10 (#4, 927, BF, U8) or 1.5 V elements from 3 V 2xLR10 packs ...

4. AlphaSmart - Wikipedia

   en.wikipedia.org/wiki/AlphaSmart

   The original rechargeable NiCd battery pack was not compatible with this model. Instead, it used a new optional nickel metal hydride battery (NiMH) pack that lasted longer and eliminated the memory effect of NiCd batteries. The AlphaSmart 3000 had the customary 8 files, each with a capacity of 12.5 pages (about 25 kilobytes), for a total of 100 ...

5. Battery nomenclature - Wikipedia

   en.wikipedia.org/wiki/Battery_nomenclature

   A zinc-carbon lantern battery, consisting of 4 round "size 25" cells in series. Terminated with spring terminals. 4LR25-2: 4: L: R: 25: 2: An alkaline lantern battery, consisting of 2 parallel strings of 4 round "size 25" cells in series 6F22: 6: F: 22: A zinc-carbon rectangular battery, consisting of 6 flat "size 22" cells. Equivalent to a PP3 ...

6. 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.

7. Lantern battery - Wikipedia

   en.wikipedia.org/wiki/Lantern_battery

   More common in Europe and Russia, this is a smaller, flat-pack battery mostly used in flashlights. It uses two metal strips as terminals. The shorter strip is the + terminal. Marked as 3R12, 3336, KBS (Russian КБС), 3,7-FMC-0,50 (Russian 3,7-ФМЦ-0,50), and other.