https://www.theregister.co.uk/2019/08/07/surface_bulging_batteries_and_borked_firmware/

Microsoft seems unable to catch a break with its Surface slab-tops: a software update appears to have broken Wi-Fi for some users, while bulging batteries cause grief for others.

The bulging of batteries is not an unheard of thing. As devices become ever less repairable and manufacturers strive to slice that extra half millimetre from a slab's thickness, battery technology has struggled to keep pace, and there comes a time when something has to give.