303 SR44SW & 357 SR44W Watch Batteries

The 303 battery, also known by its IEC code SR44SW, is a 1.55V silver oxide button cell measuring about 11.6mm across and 5.4mm thick. The 357, or SR44W, is exactly the same size. Here you will find every 303 / 357 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.

9 products