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spaxon It's not practical to post full size screenshots, a simple resize would be good for reading purposes.
The fact that you have 0% time without signal doesn't mean that your signal is good.Check mine for example :
View attachment 9830
Most of the time i have less than full signal.Sometimes it's way worse than that, like 75% of the time between 1 to 3.So you check your signal with an app like gsam, the screenshot above it's from that.Install gsam and gsam root also.I'm not saying that bad signal is the culprit of your battery drain but if you wanna be sure you can't find out from android's battery stats.
And announcement for all, new google play services are out, version 7.2.27.Maybe they finally fixed some issues...