Battery Tester Checker Universal Battery Tester Monitor (BT01) Quick Sense(BT01): Battery Tester Checker Universal Battery Tester Monitor for AA AAA C D 9V 1.5V Button Cell Batteries Easily check if the batteries are good or bad. It can test different types of batteries, even rechargeable ones. Fit For: AA/AAA/C/D/9V/1.5V Button Cell Battery (Batteries not included) This will keep you from wasting good batteries by throwing out good ones. Small and practical - Simple but effective little battery tester checker(BT-168), compact size and lightweight, easy to carry.