Hi guys, I'm spoilt for choice and I do not know what to get. Maha Powerex MH-C801D or MH-C9000 or MH-C800S? From what I know is that c801d charges the fastest while the c9000 got this thing to know the condition of the batteries. Lastly the c800s would be a c801d but charges slightly slower. I suspect the price difference of the 801d and and c800s is just the adaptor which supplies the current. Any views?