I can’t say much about how effective is this Chuwi Hi10 in Win10 Sleep mode, as to avoid the battery drain I quickly activated the Hibernate mode and set it in Power Options in a way the device use it after few hours of inactivity: Enable / Disable Hibernate in Win10
There’s an Energy saver mode too, available in notification area, but I was unhappy with the result.
What’s for sure is Hi10 (with Win10, can’t say about Android) does not seem to be as effective as my cheap Android Lenovo TAB A7-40 A3500 which can last weeks (3-4, if not more !) in standby with wifi activated…