You should use hibernation to extend battery — Here's how on Windows 10

[Windows Central]

If you want to improve your laptop's battery life, then you should be using hibernation on Windows 10.
On Windows 10, hibernation is a power-saving feature that works by saving the content in memory onto the hard drive (inside the Hiberfil.sys hidden system file), allowing a complete shutdown of the device to extend battery life without losing your current work. The next time you resume, the previous session will load into memory, allowing to pick up where you left off.

Full story from the WindowsCentral blog...