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2. 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.

3. Silver oxide battery - Wikipedia

   en.wikipedia.org/wiki/Silver_oxide_battery

   Silver oxide battery used to power a quartz watch movement; battery is marked as containing no mercury Until 2004, all silver oxide batteries contained up to 0.2% mercury , incorporated into the zinc anode to inhibit corrosion from the alkaline environment. [ 12 ]

4. Wireless Set No. 19 - Wikipedia

   en.wikipedia.org/wiki/Wireless_Set_No._19

   Wireless Set No. 19 MK II at the Infoage museum. The Wireless Set No. 19 was a Second World War mobile radio transceiver designed for use by armoured troops of the British Army. First introduced in 1940, the No. 19 began to replace the pre-war Wireless Set No. 11. Two modified versions were introduced, Mk. II in 1941 and Mk. III in 1942.

5. Mercury battery - Wikipedia

   en.wikipedia.org/wiki/Mercury_battery

   Mercury battery "РЦ-53М"(RTs-53M), Russian manufactured in 1989. A mercury battery (also called mercuric oxide battery, mercury cell, button cell, or Ruben-Mallory [1]) is a non-rechargeable electrochemical battery, a primary cell. Mercury batteries use a reaction between mercuric oxide and zinc electrodes in an alkaline electrolyte.

6. Watch battery - Wikipedia

   en.wikipedia.org/?title=Watch_battery&redirect=no

   This page was last edited on 12 July 2007, at 13:56 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...

7. Watch - Wikipedia

   en.wikipedia.org/wiki/Watch

   The movement of the watch draws its power from the rechargeable battery or capacitor. As long as the watch is regularly exposed to fairly strong light (such as sunlight), it never needs a battery replacement. Some models need only a few minutes of sunlight to provide weeks of energy (as in the Citizen Eco-Drive).