Button Cell Battery, 30mAh, Silver Oxide
From Amazon
Varta V 371 1.55 V 44 mAh Watch Cell Pack of 1
Conrad Electronic
Varta Button cell SR69, SR921 1.55 V 1 pc(s) 30 mAh Silver oxide SILVER Coin V371/SR69 Bli 1
BatteryUpgrade
Varta V371 / SR69 / SR920W Coin cell battery (Amount 1)