Jucato, Mgamerz

Diablo5 is only a theme and it can't drain the battery.
Telescope updates the thumbnails only then it shows them and Telescope just receive the pictures from OS as well as other applications so it cant drain the battery as well.

But!
The screen rotation require some kernel modification and it can cause the battery drain. Clock and load applets can use more power, check it too.
But not Telescope and Diablo 5, be sure. You can ask about it Mitrandir - Telescope developer.

Best regards,
Kroll