Button Cell Battery, 42mAh, Silver Oxide 1.55V
From Amazon
Varta Watch Battery Type: V399 Voltage: 1.55 V Size: 2.7 mm Diameter: 9.5 mm Blister PDA-Point
Conrad Electronic
Varta Button cell SR57, SR926 1.55 V 1 pc(s) 42 mAh Silver oxide SILVER Coin V399/SR57 NaBli 1
BatteryUpgrade
Varta V399 / SR57 / 399 / 395 Coin cell battery (Amount 1)