Battery drain is in the order of 1% every couple of minutes even when all apps are shut off & background processes limited to bare minimum with Battery Saver active.
I've tried factory reset & clearing cache through the recovery menu to make sure I haven't got something sucking the life out and have also tried the power-level recal. whilst plugged in from HBoot restart (holding down power, volume up & down for 2+minutes) to no avail.
Battery health is apparently good according to every app I've tried.
Currently running around with a battery-bank in my pocket to keep the phone alive.