Re: surface pro 3 not detecting battery
Try these steps:
1) After booting the system with the power adapter connected, Hold Down the power button until the unit powers itself off. (Do not swipe down.)
2) Disconnect the power adapter from the unit.
3) Press and hold the Power Button (wait for a depleted system battery icon full screen)
4) re-connect the power adapter to the unit.
5) Press and hold the volume up and Power button for 15 seconds. (the unit keyboard will light up then power down if you hold it the full 15 seconds.)
6) Press and hold the volume up and power button until the keyboard lights up (about 5 seconds)
7) If the system/bios menu appears, select exit and restart
8) Battery is present and charging.