But now, say goodbye to such stupid action since you are going to living with experienced assistant --- Dlyfull Universal Battery Tester. < ul >< li > HIGH COMPATIBILITY : It is not only suitable for AA, AAA, C, CR123A, D, 9V, N, CR2, CRV3, 2CR5, CR - P2 cylindrical battery testing, but also good for checking a wide variety of button cell batteries.