On battery life, LXDE is certainly the lightest desktop environment on its own, and its default applications are very light. But after LXDE, the difference between other desktop environments is actually not great. In some cases, XFCE is actually less lightweight than GNOME Shell! The power management is actually pretty similar. The features that drain power the most are applications. If you use your laptop for libreoffice, you will not get significantly worse battery life on GNOME vs a reputedly lighter desktop environment such as MATE or XFCE. Other than just the shell or a window manager such as Fluxbox, the best battery life is LXDE+no wallpaper+lightweight apps. So my point is for an average user who likes the wallpaper, WiFi access, heavy applications such as Libreoffice, MATE is not much better than GNOME.
KDE on the other hand, is bloated (QT?) and therefore is a battery guzzler.

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