The 321 watch battery, also known as SR616SW (IEC code SR65), is a 1.55V silver oxide button cell about 6.8mm across and 1.6mm high. This page brings together every 321 battery we stock, all genuine Japanese cells from Maxell, Murata, Seiko and Seizaiken.
The SW at the end of SR616SW tells you it is a low drain cell, made for analogue watches with a low power draw. Not sure which battery you need? Search any code in our watch battery chart.
UK delivery is free on every order.
