It is discussed in detail in the Kobo Aura One owner thread. Underneath one of my posts
https://www.mobileread.com/forums/sho...&postcount=220
Just add PeriodicAutoSync=false to the kobo ereader.conf file (in .kobo\kobo) under
[ApplicationPreferences]. It does the trick for the draining when in sleeping mode.
The rest... I just changed my One, and up to know see no improvement in the battery drain when in use - but I'll wait till it calibrates (two full discharges/charges). But I regret the screen of the former, which felt whiter. My new one feels to me as it did with one step up in the comfort light.