You should use silver-oxide “SR” batteries instead. 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. If youre looking for a replacement watch battery, youll find an extensive selection right here with BuyaBattery. For example, the common SR626SW measures 6.80 by 2.
IEC naming focuses on the battery size in millimeters. Simply insert a watch battery through the correct. IEC “SW” indicates low-drain while “W” indicated high-drain. The disc is 5 inches in diameter and made of sturdy, 1.5mm thick, white plastic with precision cutout slots. The377 watch battery provides 1.55 volts of power and has a capacity of 29 mAh. This watch battery size has a diameter of 7.9 mm and a height of 2.6 mm. Where Silver Oxide cells score over their Alkaline counterpart is in their ability to maintain a more stable voltage. In fact Rayovac make only two Alkaline button cell sizes but approximately 30 different Silver Oxide watch battery sizes. It’s also known as the SR626SW or the 626 battery. There is a much wider choice of Silver Oxide watch battery sizes. All popular compact watch batteries are 1.55 Volts and use the IEC SR prefix. The 377 battery is a common size for many watches, especially those with big faces or multiple functions. I am only listing batteries used by one or more major watch manufacturers. This chart is organized by diameter and height in millimeters. To find the brand you want, simply type the name, such as 'Sony watch batteries,' into the search bar on any E-commerce page. Buyers also have the option of purchasing in two-packs, four-packs and large 10-packs of batteries. 
They are made in Switzerland by the Swatch Group and are much more reliable in terms of sizing and capacity than cheap knock-offs. E-commerce offers a wide variety of sizes and types of watch batteries from different sellers. 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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