I just bought this new used it one evening and found out it charges batteries by set of two. I had to buy another charger that does charge single batteries.I am also including two 9V NiMH. Everything for $30.00 shipped inside the 48 states. VANSON UNIVERSAL "SMART" BATTERY CHARGER INTELLIGENT CHARGER WILL PROTECT YOUR BATTERIES! Easy to use. this charger can charge batteries of all types(Nicads and Nimh) and all sizes AAA, AA, C , D and 9V.It can be powered by both an external AC adapte(included)r or the car lighter plug(included) , so you can charge your batteries at home or on the go. Thanks to its Intelligent microprocessor this charger will stop charging once batteries are fully charged protecting your batteries from burnouts and short lifespans. Features: Battery life will be protected by negative delta V (- delta V) detection and timer protection for AAA, AA, C & D size batteries. Use constant current pulse charging system Recharges NiMH / NiCd batteries at same time for 2 pcs or 4 pcs AA / AAA /C/D and 1-2 pcs 9V cells Automatic charge current selection for the different size of batteries. LED display for rapid charge / trickle charge / bad cell detection for AA, AAA, C & D size battereies: Red LED --- Rapid charge Green LED --- Cell are ready for use / trickle charge Flashing RED LED --- cells are not suitable for charging For 9V batteries: RED LED --- charging Measurements: 5.0"W x 6.7"L x 2.5"H. Weight: 2.0 lbs Charging Time: AAA size: capacity: 600-900mAh 1.5 - 3 hrs. AA size: capactiy: 800 -2500mAh 1- 3 hrs. C size: capacity: 1200 -4500mAh 2 - 7 hrs. D size: capacity: 1.2 -10 Ah; 2- 15 hrs. 9V capacity: 100mAh-250mAh 9-18 hrs.