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2. Lithium iron phosphate battery - Wikipedia

   en.wikipedia.org/wiki/Lithium_iron_phosphate_battery

   Single "14500" (AA battery–sized) LFP cells are now used in some solar-powered landscape lighting instead of 1.2 V NiCd/NiMH. [citation needed] LFP's higher (compared to NiMH/NiCd) 3.2 V working voltage lets a single cell drive an LED without circuitry to step up the voltage.

3. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   This battery had two-pin connectors. They were a single ⌀3.2 mm negative pin and a single ⌀4.0 mm positive pin spaced 13.0 mm apart. PP11: 4.5 + 4.5: H: 91.3 L: 65.1 W: 52.4 This battery contained two independent 4.5 V batteries, and had a four-pin connector. 9 V with a center tap was available by wiring in series.

4. Comparison of commercial battery types - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_commercial...

   Under certain conditions, some battery chemistries are at risk of thermal runaway, leading to cell rupture or combustion.As thermal runaway is determined not only by cell chemistry but also cell size, cell design and charge, only the worst-case values are reflected here.

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. AA battery - Wikipedia

   en.wikipedia.org/wiki/AA_battery

   A Li-ion 1.5V AA-size battery, sold by the Chinese company Kentli as "Kentli PH5" since 2014 and with similar batteries later available from other suppliers is a AA-sized battery housing containing a rechargeable 3.7 V Li-ion cell with an internal buck converter at the positive terminal to reduce the output voltage to 1.5 V. [19] The Kentli ...

7. List of transponder codes - Wikipedia

   en.wikipedia.org/wiki/List_of_Transponder_Codes

   Civil flights in classes A, C and D airspace, or IFR flights in class E airspace. [6] US: External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.) [3] 3100, 3200, 3300, 3400, 3500, 3600, 3700 US: External ARTCC subsets.