Watch Battery 309 - Renata
309 is a silver oxide low drain battery 1.55 V.
It measures 7.9X5.4mm.
This battery is mercury free and has a capacity of 80 mAh.
Renata Switzerland is a leading manufacturer of premium button cells for watches and many electronic products.
Interchange: Energizer 309, Maxell SR45SW, Varta V309, Rayovac 309, Duracell D309/393, I.E.C SR754 (SR48).