Thanks to everyone who answered, this is working like a charm on every way.

At the beginning.i left 250 as lower and 850 as max, then i raised it to 900, but it went bananas and rebooted. As my settings weren't saved as default it then remained 500 and 850, a couple of days now and nothing strange nor killing battery so i'm very happy with this.

Thanks a lot to everyone, specially the masterminds behind this awesome project.

Now i'll be roaming around to seek how many other ways could i squeeze my phone.