Thank god I wasn't the only one with this problem. I hope it is software-bug rather than hardware-problem in DC-11. I almost bought a spare battery for the N900 but external power-pack is much more convinient... if it works. Hopefully this will get resolved. I started to use my N900 more heavily as mp3-player too, got about 8hrs of listening time on it and it wouldn't be very handy to have to recharge with dc-11 in the middle.