Button Cell Battery, 20mAh, Silver Oxide
From Amazon
VARTA V364 / SR 621 SW Battery silver oxide, 1.55 V, 17 mAh)
Conrad Electronic
Varta Button cell SR60, SR621 1.55 V 1 pc(s) 17 mAh Silver oxide SILVER Coin V364/SR60 Bli 1
BatteryUpgrade
Varta V364 / SR60 / 363 Coin cell battery (Amount 1)