Remote Controller Battery, Disposable Battery, 38mAh, Alkaline 6V
From Amazon
Energizer Special E11A (L1016 Alkaline Battery, 6 V, Pack of 2)
Conrad Electronic
Energizer A11/E11A Alkaline 2er Non-standard battery 11A Alkali-manganese 6 V 38 mAh 2 pc(s)