Yesterday, after using the ipod, I put it on charge using the USB on my imac, after 4 hours it only showed a quarter full, I turned it off, turned it back on again and left it overnight, this morning it onlyshowed three quarters full.
This is my second ipod nano, the previous one exhibited the same problem and was changed by apple, is there anything I can do before I go down that route again.
My wife only uses it for an hour each day in the gym, and then probably an hour or so on bluetooth speaker.
Whilst charging make sure your iMac doesnt go to sleep and try to make sure itunes is constantly open whilst connected. If this does not work try restarting the device by holding down both the home button and slep button down.