I used to be a solid fanboy of Microsoft products dating back to the turn of the century with Windows CE devices ending in their cancellation of support for Windows Mobile/Windows Phone, leaving me once again stranded as if the vendor were some tiny startup with no financial strength to back up their product.
As for the lousy, expensive Surface Book, that was the last straw for me. I will never again buy any MS hardware. Terrible support for defective/dangerous batteries.
My batteries inflated like balloons, causing my display to bulge so much that it cracked. BTW, if you can insert a long needle or hatpin under your bulging display, pop the mylar bag enveloping the batteries' metal casing. It appears to be a protective layer in case your battery leaks. Mine appeared to be inflated with gas rather than electrolyte leakage. The battery was toast so you wouldn't be able to use the display as an untethered tablet. The other option is the one that I mistakenly chose to do which is to disassemble the display panel and replace the battery. The newest battery that I could find was dated to 2018, so probably not much capacity left. Removing all the parts to remove the battery resulted in numerous tiny use-once connectors breaking which has involved purchasing many replacement parts. It was never designed to be fixed.
The lifespan of the Surface Book, like many similarly designed devices, is determined by the lifespan of the batteries. Once depleted, you may as well part out your computer, because trying to replace out-of-date batteries is a fools' errand. That said, I will never buy another laptop from MS or other makers, that cannot be cracked open to replace the battery.
Perhaps the FAA should be notified that these should be banned from air travel like the Samsung Galaxies were. They could be a fire hazard.