I just bought the m-8800 after reading good things about it. I threw in 4 duracell, 2650maH, non-duraloop, made in japan cells and after the were fully charged put them in my digital camera. I tried the camera the next day and it said change batteries. They all read around 1.375V. I was wondering if the charger ruined the cells and how can I tell if batteries are bad if they read a decent voltage?