I have the Surface Pro 4, brilliant, stopped using my workstation since I have the dock too, no complaints. Wondering if it's worth upgrading now or better to wait.
I got this from John Lewis for £679 with 2 years warranty. Great portable machine on site with battery optimised I can get nearly a full day 7-8 hours before I need to top up. Has USB C so I have not tried but should be able to charge from portable battery bank.
There is videos on youtube how to change the battery but it is not something a DIY job. If you ask some of the phone computer repair shops they might do it but you would be taking a chance and it will be expensive.
I own a surface, I use it as my travel laptop for using at work. For that it is amazing, lightweight and feels great to type on. As others have said. Battery is terrible I have to keep it plugged in. Also I have heard if you break the screen it is near impossible to get fixed. Also for the price, you cannot upgrade any internals or battery in the future as it hard for anyone to access the internals. I’m happy as I got it at a bargain price. But would not pay this, rather get another laptop deal.
Laptop I have one later I slowly feel that the life of the laptop is a little short (annoyed)