My 2505TM has a battery status button in the menus - it says 94%, but it will not turn on if not plugged into the power.  I left it connected to the computer overnight and powered off, and it still would not accept a charge.  It appears the battery has gone bad, but the 2505 does not know that it is.   The battery fuel guage is obviously not working.   Has anyone had this problem with a 2535, or is this going to continue to be a problem with all 2500 series units?