381 SR1120SW & 391 SR1120W Watch Batteries

The 381 battery, also known by its IEC code SR1120SW, is a 1.55V silver oxide button cell measuring about 11.6mm across and 2.0mm thick. The 391, or SR1120W, is exactly the same size. Here you will find every 381 / 391 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.

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