364 SR621SW & 363 SR621W Watch Batteries

The 364 battery, also known by its IEC code SR621SW, is a 1.55V silver oxide button cell measuring about 6.8mm across and 2.1mm thick. The 363, or SR621W, is exactly the same size. Here you will find every 364 / 363 watch battery we stock, from Renata, Maxell, Seiko, Murata and Seizaiken, so you can pick the brand you prefer.

The SW version is made for watches with a low power draw, such as most simple analogue quartz watches, while the W version suits watches that draw more power, for example those with alarms, backlights or chronograph functions. If you are not sure which you need, fit the same type as the battery that came out of your watch.

UK delivery is free on every order, and orders placed before 2pm Monday to Friday are dispatched the same day.

6 products