Again thanks so much for your advice.
I have managed to open the UBook Pro case and removed the battery.
Also, happy to update that the Ubook Pro works fine running on the Power adapter.
I actually got my Surface Pro 7 already but I guess I now have a spare “wired” device in the Ubook Pro.
Let me post some photos for people’s reference if anyone ever needs to remove the battery / remove the casing.
First, remove the 2 screws that are under the kickstand.
Then put a thin card (others have mentioned a guitar pick is good, the leftover SIM card after the SIM Card has been popped worked fine for me), push between the part between the black color casing and silver metal casing :
Then just keep using the card to slide it all around the tablet to “pry” open the casing. Once the cover has been pried open, you can lift the entire metal case off and will see the interior:
Connector B : connector to Battery (remove this by hand)
Connector A : You have to remove either side to remove battery safely, but on my set both side connector had super glue on it, so i remove the battery with both sides connectors attached, the battery is stuck down on its bottom on both left and right sides with double sided tape, when i finally managed to pull the battery off by force from the double sided tapes on its back, Connector A on the right side actually came off so i had to place it back in and clip it back. I was worried I had broken the Connector but thankfully it seem alright.
Blue Arrows : indicating three places where the double sided tape needs to be removed.
Picture of the Battery Connector removed :
Picture of the metal casing :
Picture of the battery removed (Connector A on both sides have to be connected back and 2 wires on top and right side taped back) :
Front and back photos of Battery :
Then just match up the metal casing and the opened Ubook and click the casing back together, be wary of the volume button, I had to push the volume button back out in order to click the casing back to close up. Then put the 2 screws back into the back of the casing behind the kickstand.
Connect the tablet to the power adapter, plug in power.
And thankfully the Ubook Pro started to power up :
The screen now no longer pops up at the top near the volume screen (which was how i was alerted to the problem - see first post) :
Tried the touchscreen and it seems normal.
I haven’t tried all the functions (wifi, bluetooth, volume, front and back camera) but for now, i’m just glad that it powers up.
Hope this helps anyone who meets the same problem.