Button Cell Battery, 80mAh, Silver Oxide 1.55V
From Amazon
Varta V303, 160 mAh, 1.55V Silver-Oxide 1.55V non-rechargeable battery - non-rechargeable batteries (160 mAh, 1.55V, Silver-Oxide, Button/coin, 1.55 V, SR44, 160 mAh, Silver)
Conrad Electronic
Varta Button cell SR44, SR1154 1.55 V 1 pc(s) 160 mAh Silver oxide SILVER Coin V303/SR44 NaBli 1