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2. Battery holder - Wikipedia

   en.wikipedia.org/wiki/Battery_holder

   By the 1920s, battery holders used twin metal clips (like fuse holders) to hold the battery in place while making electrical contact. Patent no. 1439429 was granted in Dec. 1922 for an assembly with two spring arm clips, a small switch, and a lamp assembly on the end of connected wires.

3. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   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. There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart.

4. Battery terminal - Wikipedia

   en.wikipedia.org/wiki/Battery_terminal

   Most cylindrical dry batteries (such as the AA battery) have a projection at one end (positive) and a flat base (negative). These mate with metal strips or springs in the battery holder . Six-volt lantern batteries typically feature two coiled, cone-shaped spring terminals, designed to mate with flat contact plates on the inside of the battery ...

5. 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 ...

6. Electrical connector - Wikipedia

   en.wikipedia.org/wiki/Electrical_connector

   Many plug and socket connectors are attached to a wire or cable by soldering conductors to electrodes on the back of the connector. Soldered joints in connectors are robust and reliable if executed correctly, but are usually slower to make than crimped connections. [ 1 ]

7. Nine-volt battery - Wikipedia

   en.wikipedia.org/wiki/Nine-volt_battery

   The PP3 battery has both terminals in a snap connector on one end. The smaller circular (male) terminal is positive, and the larger hexagonal or octagonal (female) terminal is the negative contact. The connectors on the battery are the same as on the load device; the smaller one connects to the larger one. [5]