The battery drain on Surface Book 2 is due to the new hybrid shutdown mechanism used in these devices, which keeps the core of the operating system in RAM while the computer is turned off to provide the fast boot function. This feature, along with a new
connected standby state, are new features built into surface devices.
To prevent the system from shutting down using hybrid shutdown, you can press the Shift key while selecting the shutdown option from the start menu.

Hello, if you mean to literally press and keep holding shift while clicking shutdown from the start menu I'm sorry to say that it does not work. I held shift through the clicking of the power button, clicking shut down, and I kept holding on to it until the
screen turned off. This morning, 7 hours later, clipboard had 90% battery and battery 2 had 93% battery (both were at 100% when I shut down). Please let me know if I did anything wrong.