chargin problems

[blinking8s]

sometimes, not always, my CB-5L charger unit that came with my 300d will tell me the battery is fully charged, when I go to put it on the camera, it will be low batt...anyways have a clue, I checked the back of the battery and everything looked clean

when it does this i have to take the battery off a few times till the light starts blinking when i put it back on.

[Canuck]

I have had this happen a few times. I put a different battery on and let it charge for a while then swap them out and leave the one giving me problems on there even if it shows full charge.