I sometimes have that as well - I just keep the pack charging on the cable, but it's not a huge issue - I think sometimes it does charge even though it's showing the green light. But since I have 1 third-party rechargeable battery pack and 1 Xbox-branded rechargable battery pack, I think that seems to be an issue (third-party may not work as well). I'm not sure if there is a definite fix, but doesn't really affect me that much. Sorry if I couldn't be more help!