Im working on one of these for a friend. The symptoms they had were no battery use though the battery is lit green. While the keyboard/mouse stopped responding.
I figured possibly the connections were loose to the bottom of the system. They are fine. I then attempted to upgrade system after seeing it an ancient version (656). I totally missed the keyboard/ mouse fix specific for that firmware until after I attempted a upgrade.
It worked, however. The system will not boot as its trying to update the firmware now, and sees no battery (again though the green light is on and the EC checks out). So it shuts itself down.
I'm guessing either messed up eprom in the battery or a bad battery. I have a life multi charger at home I can attempt to at least see if it has any charge. If it does. Not sure whats steps to do next. If it doesn't. Is there a trick I can do to stop it or bypass checking for battery or at least bypass the firmware for the moment? Until I can find a new battery.