Things to be running a bit delayed ? . Still delayed after you replace the batteries ? . Why waste inserting and removing battery after battery when you can just test it.Just get the battery tester to help you find reclaimable battery ! . From D-FantiX v Battery Tester Checker for 9V 1.5 V and AA AAA Cell v Easy-to-read color-coded with `` well-behaved '', `` nether '' and `` Replace/Recharge '' indicators v Checks power level of 9V and 1.5 V batteries v Can quickly test the capacity of your battery. v Test duple sizes of batteries in one unit v prizefighter and tight, measures 11 × 6 × 2.5 cm v The battery tester 9V ,1.5 V, AA, AAA, C, D and Cell Button Type batteries. Tester does not any internecine batteries to operate. Battery capacity criteria ruby = supersede lily-livered = nether Power = well-behaved The Battery Tester may be used to test the stalking sizes : 1.5 V ----- AAA, HP6, MN2400, RO3, AA, HP7, MN1500, UM3 C, HP11, MN1400, UM2, D, HP2, MN1300, UM1 and Cell Button Type batteries. 9V ------, MN1604 ,6 F22 ,006 P NOTE : 1. You can simply battery voltage to determine whether the capacity of the battery is nether or high.It wo n't directly detect the battery capacity precisely 2. Do n't : The Battery Tester is activated by the battery being checked. Kepp test as sawed-off as poosible, to avoid extra battery drain.