The 366 watch battery, also known as SR1116SW, is a 1.55V silver oxide button cell about 11.6mm across and 1.6mm high. This page brings together every 366 battery we stock, all genuine Japanese cells from Maxell and Seiko.
The SW at the end of SR1116SW 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.
