Watch Battery 397 - Renata is a silver oxide low drain battery 1.55 V.
It measures 7.9 X 2.6mm. Renata 397 is mercury free and has a capacity of 32 mAh.
Renata Switzerland is a leading manufacturer of premium button cells for watches and many electronic products.
Interchange: Energizer 397, Maxell SR726SW, Varta V397, Rayovac 397, Duracell D396/397, Timex N, Citizen 280-28, Seiko SB-AL, I.E.C SR726 (SR59).