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If none come up in the search that are model-specific and contain the battery size, proceed to the next step. Remove the back of the watch to look at the numbers on the battery directly. You may need a knife to wedge the back off, since the gap between the watch back and the rest of the body is usually very slender. A screwdriver will almost never be narrow enough to fit into the gap.
A quartz watch is powered by a battery - it keeps time by pulsing electrical current through the tiny quartz crystal, which oscillates at a predictable rate and hence keeps very accurate time. Quartz watches can have either an analog dial with the traditional hands or have a digital display - or both.