Has anyone tried charging it with the EC Technology charger (
http://www.amazon.co.uk/dp/B00F5Q4F0U)? Do you think that will work?
My experience so far would lead me to be skeptical. some of these "intelligent" devices say iPad @2.4A and if it doesn't recognize an iPad you don't get 2.4A. If you already have one or plan to get one test it thoroughly and return it if it's not working well.
If it will deliver 2.3A which is as much as Surface 3 will ask it should charge from flat or below 10% in about 4 hours while the Surface 3 is shutoff.
If you install BatteryBar (free) and you observe negative charge rates while Idle it's not working.
Under load you may see negative charge rates at times however it should still charge slowly even under load. If it's not you are not getting the full output from the battery.
If you see Batterybar switch from A/C or charging blue bar to battery green bar while it's plugged in it's failed and shutdown.
Unfortunately these "intelligent" devices have some quirks and might enter a mode in which it's supplying minimal power and not actually charging and the casual user has no way of knowing it.