I came from a lumia 640 and so far the battery life on the 950 xl is terrible. Im using the single sim build .29. Idle time is great, about 1% an hour but usage is terrible, in edge my phone uses about 1% every 2-3 minutes. Also I've been having some weird things going on with battery icon %, sometimes it will say 60% and when I come back after not using my phone for an hour or so it might say 63%. Its done that a few time, other times it will stay on a % for a while then drain a few really fast. Is this a faulty phone or just new phone os issues? Also I have drained and charged a few times to calibrate it as some have recommended.