On my Essential PH-1 I'm easily getting the same battery life as I did on my black edition KEYone. It's amazing what pure Android, an 835, and a +/- 3000mah battery can pull off without all the oem bloat.
All this talk of needing a huge battery and a power sipping Soc to get decent battery life from an Android is a pile of rubbish. TCL could easily match the performance of the PH-1 (or better) with BlackBerry Android with top of the line hardware, if they so chose...