Aa batteries are probably the most commonly used battery as so many toys and appliances use them this bulk pack provides not only a good quantity of batteries it also includes a handy tester which will enable you to check the most commonly used batteries aa aaa c d and 9v that you have to see if they have any charge in them before throwing them away14 high performance alkaline batteries are included in a neat storage box along with the easy to use battery tester contents features14 x high perf