Microsoft rolled out another firmware update to Surface Pro 4 for September 2018. It will improve Surface Pro 4's security and battery life when not in use.
Battery Life
Surface Pro 3 gets firmware update (September 10, 2018) to improve battery life
Microsoft rolled out another firmware update to Surface Pro 3 for September 2018. It will improve Surface Pro 3's battery life when not in use. You can now get this new firmware update on Windows Update.