I’m not vouching for Microsoft, mind you, but if the latest official assertion about the Surface Book 2 battery is true, it’s a game changer.
Since the dawn of Surface time, there’s been no way to have a battery replaced: Your only option was to swap out the entire unit, an expensive proposition. A recent post by a Microsoft employee on the official Microsoft Answers Forum raises a glimmer of hope that batteries in the Surface Book 2 can be replaced.
Surface owners have complained about short-lived batteries and their expensive replacements going all the way back to the original Surface and Surface Pro. Way back in February 2013, poster Hyperlexis described his interaction about a bad Surface Pro battery with a Microsoft Surface rep: