Disposable Battery, Alkaline 9V
From Amazon
Ansmann 6LF22 9 V Block E Alkaline Battery (Pack of 2),Different Designs
Conrad Electronic
Ansmann 6LR61 Red-Line 9 V / PP3 battery Alkali-manganese 9 V 2 pc(s)
OnBuy
Ansmann 6LF22 9 V Block E Alkaline Battery (Pack of 2),Different Designs