The batteries I have for the 40D appear to be doing strange things. The in-camera battery indicator, which has been accurate, will show them at one-third power, but when I put them on the charger, it goes to full power in a matter of seconds, instead of the 30 mins or so it usually takes.The battery indicator then shows them at full power when they couldn't possibly have been. They are both Canon batteries and both about the same age. Anyone else had this issue? Cheers