Button Cell Battery, 21mAh, Silver Oxide
From Amazon
Varta V319 SR527SW Battery 1.55 V 1 unit
Conrad Electronic
Varta Button cell SR64, SR527 1.55 V 1 pc(s) 21 mAh Silver oxide SILVER Coin V319/SR64 NaBli 1
BatteryUpgrade
Varta V319 / SR64 / 319 Coin cell battery (Amount 1)