Have you recycled the battery. It sounds to me like you're just charging it and that's it. Occasionally you have to completely discharge the battery and then charge it. Charge rate on nimh is a little higher than acad or lipos, but 1 amp is pretty high for a 650. Also the faster you charge the less charge your battery will take before it thinks it's fully charged.

jeffdom-all the parts are interchangeable between the blade and cp2, but you have to change the entire mechanism. For instance, the cp2 head will fit the blade, but you have to change the entire head. The main shaft and drive gear are the same way, but IMHO the cp2 parts are far superior to the e-flight ones. I'm not sure at this point if I have a blade or a cp2 with a blade canopy. And that's not including the GWS tail and MX400 LG.