Disposable Battery, 145mAh, Silver Oxide 6.2V
From Amazon
VARTA Batteries Electronics V28PX/4SR44 silver battery 1-pack, Battery in original blister pack of 1
Conrad Electronic
Varta SILVER Cylindr.V28PX/4SR44 Bl1 Camera battery 4SR44 Silver oxide 145 mAh 6.2 V 1 pc(s)