Watch Battery Murata 391 is a silver oxide high drain battery 1.55 V. Watch Battery 391 measures 11.6X2.1mm. Since 2017, Sony watch batteries were manufactured by Murata. The very same high-quality batteries are available today—only under the Murata brand. Surpassing production of over 10 billion silver oxide batteries, Murata is recognized as The Global Leader in both the OEM and Replacement watch battery markets.
Interchange: Renata 391, Energizer 391, Maxell SR1120W, Varta V391, Rayovac 391, Timex L, Duracell D381/391, Citizen 280-30, Seiko SB-BS, I.E.C SR1121 (SR55).