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  2. Battery terminal - Wikipedia

    en.wikipedia.org/wiki/Battery_terminal

    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 compartment. Some lantern batteries instead feature screw terminals, while still others instead feature pin holes. [1] Nine-volt batteries have snap-on connectors.

  3. IEC 60309 - Wikipedia

    en.wikipedia.org/wiki/IEC_60309

    The pilot pin is located in the centre of main contact circle on 4- and 5-pin connectors. On 3-pin (2P+E) connectors, it is located on the contact circle opposite the ground pin. The other connectors are located 105° on either side of the earth pin, rather than 120° as in the smaller variants, to make room for the pilot pin.

  4. Gold plating - Wikipedia

    en.wikipedia.org/wiki/Gold_plating

    Gold plated - gold layer thickness greater than or equal to 0.5 micron; Heavy gold plated / Vermeil - gold layer thickness greater than or equal to 2.5 micron; Gold plated silver jewellery can still tarnish as the silver atoms diffuse into the gold layer, causing slow gradual fading of its color and eventually causing tarnishing of the surface ...

  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. Why Do Electric Cars Still Use 12-Volt Batteries?

    www.aol.com/why-electric-cars-still-12-150000652...

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  7. Battery holder - Wikipedia

    en.wikipedia.org/wiki/Battery_holder

    Battery types such as the 9-volt have snap-on contacts. Battery holders for zinc-air batteries must not be completely air-tight since approximately 1 litre of air is required per ampere-hour of discharge per cell. The battery holder may include a valve integrated with the device power switch to allow air to be admitted when the device is ...

  8. Most older Americans want to age in place, new report finds ...

    www.aol.com/most-older-americans-want-age...

    Americans are getting older, but our housing options aren’t keeping up. That’s the premise of a new report from AARP, which found that most people want to stay in their homes and their ...

  9. Nine-volt battery - Wikipedia

    en.wikipedia.org/wiki/Nine-volt_battery

    The nine-volt battery, or 9-volt battery, is an electric battery that supplies a nominal voltage of 9 volts. Actual voltage measures 7.2 to 9.6 volts, depending on battery chemistry. Batteries of various sizes and capacities are manufactured; a very common size is known as PP3, introduced for early transistor radios. The PP3 has a rectangular ...