Well, I went through the various parts of the system and found the network options and turned them off, charged to 100% and whilst being used with the power plugged in I seemed to be breaking even.
Actually used the power button and slid down the screen to shutdown last night, with the power on 68%.
Checked this morning and it's down to 20%....
I've run the Windows 10 Troubleshooter for power options and all that's done is turned on the Sleep options......
And that's supposed to save power?
As for Follett's suggestion about Fast boot - where's that in Windows 10? I can't find it on the Tablet or my Desktop? I thought it was removed in Windows 10?
But, yes, my thinking is that the tablet isn't shutting down properly and is going into sleep/hibernate mode (can't find a hibernate file, however). Actually, starting to think that it's something Windows related - as occasionally, my Desktop when shutdown will restart itself. And, then I've got to shutdown again.