Disposable Battery, Alkaline 1.5V
From Amazon
Duracell MN2400B12 household battery Single-use AAA Alkaline 1.5 V – Batteries (Single-Use Battery, AAA, Alkaline, Cylinder, 1.5 V, 12 Pieces)
The Battery Masters
Duracell Plus Power AAA Pack of 12
Lyco
Duracell AAA Alkaline Battery - Pack of 12