Disposable Battery, Camera Battery, 50mAh, Alkaline 12V
From Amazon
VARTA Batteries Electronics V23GA Alkaline button cell battery 2-pack, Button cells in original blister pack of 2
Conrad Electronic
Varta ALKALINE Special V23GA Bli 2 Non-standard battery 23A Alkali-manganese 12 V 50 mAh 2 pc(s)