Must order in increments of 24. EN91 Energizer Industrial AA Alkaline Battery: AA Cells packaged as follows: 24 batteries per box; 6 boxes of 24 batteries to equal 144 batteries per case. These batteries are the industrial line of the Energizer brand alkaline batteries. The have a 5 year shelf life with the expiration date stamped on each battery.Energizer Industrial line may not be sold to the general consumer public; it is for commercial users only.