These power a wide range of devices, from audio players and digital cameras to toys and torches. Alkaline technology provides much better value for money than traditional zinc chloride batteries, especially with more demanding applications such as CD or MP3 players 
9V / 6LR61 is a high performance single use Alkaline battery that will perform exceptionally well in all applications. 

Batteries per Pack: 1   
Weight: 49.0g 
Battery Capacity: 550.0mAh 
Battery Type : Alkaline (Single Use) 
Current: 2.1000A 
Depth: 17.0mm 
Height: 48.5mm 
Voltage: 9.00V 
Width: 26.2mm 

Equivalent to: 1604, 1604A, 1604AC, 4022, 522, 6AM6, 6F22, 6LR61, 9V, 9VOLT, A1604, BLOC, CLR6, K9V, KA9, LR22, MN1604, ND65V, PP3