... , C D, 9V Button cheap price, fasht shipment! Universal Battery Checker Tester AA, AAA, C D, 9V ButtonDo not guess which batteries ... and which to throw away,place your battery between the two points of the battery tester and the easy –to-read display will ... if you can eke out another few minutes of battery life. This battery tester is a great gadget, and it really works. A ...