D-FantiX Digital Battery Tester for AAA AA C D 9V 1.5V, Household Battery Checker Tester for Small Batteries Button Cell (Model: BT-168D) SMALL & PORTABLE - Simple but effective small aa aaa battery tester checker(BT-168D), compact size and lightweight,easy to carry TESTING DEFFERENT BATTERY TYPES - The battery checker tester works with standard and rechargeable household batteries. Battery tester for AA, AAA, C, D, 1.5V,9V and button type REQUIRE NO BATTERY TO OPERATE - Easy-to-read , digit indicates power level. No batteries required.It is activated by the battery being checked PERFECT FOR HOME USE - Great small tool can tell you if your battery is good, low, or needs to be replaced.A must buy for anyone who uses regular or rechargeable batteries on a regular basis 100% MONEY BACK GUARANTEE - Click the ADD TO CART BUTTON NOW & enjoy this pratical digital battery tester form D-FANTIX, with a vision to provide 100% satisfied shopping experience to our customers. Save your money - This will keep us from wasting perfectly good batteries by throwing out good ones Don&#039;t forget : The aa aaa Battery Tester is activated by the battery being checked .Keep test times as short as poosible,to avoid unnecessary battery drain. If the digits did not show the check that battery is touching both contacts, otherwise the battery is completely dead. Good 1.5V~1.28V 9V~7.8V Low Power 1.27V~1.15V 7.7V~6V Replace Below 1.15V  Below 6V 9V Battery includes 6F22, PP3,MN1604 You can simply test battery voltage to determine whether the capacity of the battery is low or high. It won&#039;t directly detect the battery capacity precisely