For max battery: Enable smart reflex Set limits to 250-805 Choose the lowest voltage profile possible, as you are crashing with ULV, try XLV Reduce wifi power on networks that are close by Lock to 2G mode Do this for the all day connected max batterys.
Mine continuousely reboots whenever I enable smart reflex. I almost got myself in a loop I had trouble getting out of, where power drained quicker than I could charge it.....long story, but smart reflex can be interesting for some handsets. (mines a very early production run)