edit - Several months in now and the keyboard does not charge on its own. It needs to be forced into a charge. I have to do this several times a week. Despite knowing this I *still* end up in situations where I am unplugged on the couch or in a meeting room and the keyboard is completely out of power.
To force it into a charge:
- Open the Surface App - remark to yourself that the keyboard is shockingly down to less than 2% power
- Physically disconnect the keyboard from the Surface tablet
- Turn off the keyboard by holding the ESC key for about 10 seconds (the Fn key will flash then go off)
- Wait for the pen to light up then turn off (if you don't wait long enough, it won't force the charge)
- Surface Pro App now says the keyboard is disconnected
- Reconnect the keyboard to the surface - it now says Connected
- Watch the keyboard start to charge and remark to yourself how silly this all is for such an expensive device
- Repeat in 2 days when the keyboard is once again fully drained even tho it has been connected to a power source
I've also noticed that when the Surface Pro and keyboard are attached that by plugging in a powered USB C (like the one I use to charge my phone) into the side of the Surface the keyboard will also start to charge - as long as the computer ISN'T being powered itself through.
I have noticed that the keyboard stops charging when my surface pro has reached 80% smart charge or 100% full charge. Which is frustrating - the reason I upgraded to this keyboard was so that I can disconnect it. But I've yet to have the keyboard reach a full charge. I only get at best 4 hours before it dies on me and have to run down my surface pro to start the charging.
I've had limited and sporadic luck in forcing the keyboard off (by long pressing the ESC key) and reconnecting it to start charging.
Definitely very buggy considerating the extremely high price tag.