This chart converts batteries and voltage (most are 1.5 or 1.35 Volts) for Everready, Energizer, Duracell, Maxell, Panasonic, and Varta. 364 & 379 are the two most popular watch batteries there are, so expect stores to be low on these ( of course). You should use silver-oxide “SR” batteries instead.(Also note that Energizer is probably the most common brand of watch battery sold. The following batteries use mercury chemistry, as indicated by the “MR” IEC number: 313, 323, 325, 343, 354, and 387. * Note that most batteries use silver-oxide chemistry.
American companies like Duracell, Energizer, Eveready, Rayovac, as well as watch companies like Bulova, follow a numeric naming system with most batteries having a 3xx number. This standard is mostly followed by Japanese manufacturers, including Maxell, Panasonic, and Sony. 60 mm while the SR621SW measures 6.80 by 2. For example, the common SR626SW measures 6.80 by 2. IEC naming focuses on the battery size in millimeters. IEC “SW” indicates low-drain while “W” indicated high-drain. All popular compact watch batteries are 1.55 Volts and use the IEC SR prefix. I am only listing batteries used by one or more major watch manufacturers. This chart is organized by diameter and height in millimeters. They are made in Switzerland by the Swatch Group and are much more reliable in terms of sizing and capacity than cheap knock-offs. I strongly recommend buying Renata-brand batteries. Some batteries also have multiple names based on specifics of drain or capacity but these are usually interchangeable. The table below lists the most common watch battery sizes along with their various names for different standards and manufacturers. 
Watch batteries have a confusing array of names, so it can be difficult to know which battery to purchase for your quartz watch. I recommend Swiss Renata batteries, and suggest picking up an assortment of the popular sizes. Watch battery selection and sizing can be confusing, but this cross-reference chart should help make the right choice.
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