Amzqwe Battery Testers,Universal Digital Battery Tester For Aaa,Aa,C,D,9V,1.5V,3.7V Small Button Cell,Battery Tester Volt Checker For All Household Batteries, BlackIf LCD does not display,check that battery is touching both contacts before assuming that it is completely dead. The Battery Tester May Be Used To Test The Following Sizes: 1.5V AAA,HP16..