The 309 watch battery, also known as SR754SW (IEC code SR48), is a 1.55V silver oxide button cell about 7.9mm across and 5.4mm high. The 393, also known as SR754W, is the same size. This page brings together every 309 and 393 battery we stock, all genuine Japanese cells from Murata.
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.
