I tried this, battery is charging on Nokia 5800 but N900 doesnt turn on... I tried to plug/unplub batery several times but doesn't work Since i charged the battery on Nokia 5800 the yellow dot doesn't light anymore... It only lights on when N900 connected on wall/usb charger and i remove the battery I think it's dead but i don't know how??? I'm taking it back to Nokia Care tomorow and tell you what hapened there... Thank you all for helping me