Hi,
I have been experiencing this battery problem for more than half a year. My Surface Book is only slightly more than 2 years old. I noted that many customers have faced the same issue but so far most of the threads ended up not resolved (including mine), which is extremely frustrating.
I am going to give it a shot again regardless to see whether there is any hope of me still trusting Microsoft products in the future.
I purchased Surface book in December 2016. 95% of the time it is plugged in. Earlier this year, I started noticing that both battery 1 and 2 are not charging despite being plugged in. I discovered this because my laptop started to randomly shut down presumably due to the plugged in power switching to battery momentarily for not sure what reason. It happens very regularly until I got very frustrated. This is how I discovered that the batteries are not charging.
Since my wife has a Surface too, I swapped the adaptor to test out whether this is due to adaptor issue. Battery 1 managed to charge with the other adaptor but not battery 2. When I revert back to my adaptor, battery 1 maintained 50% battery life but battery 2 is still 0%. As such my laptop is now becoming a desktop as it relies on being plugged in all the time.
I contacted Microsoft Support few months ago on the problem. I have done everything stated on the Microsoft website but in vain.
I am now questioning whether this is a major hardware issue that Microsoft is not admitting or it is merely a software problem that Microsoft can't be bothered to investigate for older Surface Book? Never in my life have I purchased a laptop where the battery is 0% after 2 years. I was very excited to own my first Surface Book but my trust in Microsoft products is now wearing thin with this experience including poor support and customer service.
If I can't get a satisfactory answer or solution from Microsoft, unfortunately this will be the end of my journey with Microsoft hardware. There are too many people with the same problem unresolved. I am sure they are equally as frustrated.