348 SR421SW Watch Batteries

The 348 battery, also known by its IEC code SR421SW, is a 1.55V silver oxide button cell measuring about 4.8mm across and 2.1mm thick. Here you will find every 348 watch battery we stock, from Seiko and Seizaiken, so you can pick the brand you prefer.

The SW at the end of SR421SW means it is a low drain cell, made for watches with a low power draw such as most simple analogue quartz watches. If you are not sure which battery your watch takes, check the number printed on the old battery or search for it in our watch battery size chart.

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

2 products