well, after 3 charge cycles, and 2 uses, my battery seems right back in form. My experience with NiMh batteries was that when they went bad, they would still charge up to normal voltages, but didnt put out much real power in flight. My Lipo put out just as much as I would expect from it, and is now holding at 12.28v after 24hrs. Its a Kokam 3s 1500 (8-10c)