The 397 watch battery, also known as SR726SW (IEC code SR59), is a 1.55V silver oxide button cell about 7.9mm across and 2.6mm high. The 396, also known as SR726W, is the same size. This page brings together every 397 and 396 battery we stock, all genuine Japanese cells from Maxell, Murata, Seiko and Seizaiken.
Choose the SW version for an ordinary analogue watch with a low power draw, and the W version for watches that use more power, such as models with alarms, lights or chronographs. If in doubt, replace like with like and match the code on the battery you took out.
UK delivery is free on every order.
