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2. History of radio - Wikipedia

   en.wikipedia.org/wiki/History_of_radio

   In 1954, the Regency company introduced a pocket transistor radio, the TR-1, powered by a "standard 22.5 V Battery." In 1955, the newly formed Sony company introduced its first transistorized radio, the TR-55. It was small enough to fit in a vest pocket, powered by a small battery. It was durable, because it had no vacuum tubes to burn out.

3. Batteryless radio - Wikipedia

   en.wikipedia.org/wiki/Batteryless_radio

   Batteryless radio. A batteryless radio is a radio receiver which does not require the use of a battery to provide it with electrical power. Originally this referred to units which could be used directly by AC mains supply (mains radio); it can also refer to units which do not require a power source at all, except for the power that they receive ...

4. Eveready Battery Company - Wikipedia

   en.wikipedia.org/wiki/Eveready_Battery_Company

   eveready .com. Eveready Battery Company, Inc. is an American manufacturer of electric battery brands Eveready and Energizer, owned by Energizer Holdings. Its headquarters are located in St. Louis, Missouri. [1] The predecessor company began in 1890 in New York and was renamed in 1905. Today, the company makes batteries in the United States and ...

5. Philco - Wikipedia

   en.wikipedia.org/wiki/Philco

   philco-intl.com. Philco (an acronym for Philadelphia Battery Company) [1] is an American electronics manufacturer headquartered in Philadelphia. Philco was a pioneer in battery, radio, and television production. In 1961, the company was purchased by Ford and, from 1966, renamed "Philco-Ford". Ford sold the company to GTE in 1974, and it was ...

6. Antique radio - Wikipedia

   en.wikipedia.org/wiki/Antique_radio

   Early battery-operated sets. The minority of all-in-one commercial ac mains sets that appeared in the 1930s are plug & play. Such sets should be checked for the possible existence of live metalwork accessible to the user, and a general safety check is advisable. Many will need a repair of some sort.

7. Nine-volt battery - Wikipedia

   en.wikipedia.org/wiki/Nine-volt_battery

   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.