FeaturesAllows you to check whether your battery is good, requires recharge or replace Will test AAA, AA, C, D, 9V PP3, N and button cell batteries Pocket Size Design No need for additional batteries Easy to UseUniversal Eagle Compact Battery Tester capable of testing most dry cell batteries. Test AAA, AA, C, D, 9V PP3, N and most button cell batteries. The window shows the battery level as replace, weak or good condition using the power of the battery you are testing.