4LR44 : 6v alkaline battery (PX28A)
$ 3.95
The 4LR44 is a 6 volt Alkaline battery - GP brand. For multi-purpose applications (memory, cameras, toys, remotes, dog collars, etc.). Replaces # 476A, A544, PX28A, PX28AB, V4034PX, A28PX, L1325, and more. Battery is 1" long, and approx. 1/2" diameter.