I bought a Smart battery, not knowing they needed a different charger . Now is there an answer beside my not knowing the were different. I hope there is an answer as sales slip mentions if box is opened by me, can't be return what so ever, kind of stinks so to say or am i out-of- luck, All i did was open to see what was involved!!!!!!!!!!!! I have a nice 3s Onyx and a 1-4 cell Common Sense charger i use. Oh yes thanks!