Watch Battery, Disposable Battery, Alkaline 1.5V
From Amazon
Varta C Alkaline Battery Pack of 6 - Longlife
Conrad Electronic
Varta LONGLIFE C Folie 6 C battery Alkali-manganese 7600 mAh 1.5 V 6 pc(s)
OnBuy
Varta C Alkaline Battery Pack of 6 - Longlife