For most of the year, I've struggled with a hideous battery drain issue on my proper android phone (a Sony of recent vintage). I think I've isolated the source of power draw - the cell radio is just incredibly hungry on this particular network. If I'm streaming radio, sometimes the battery wears down from 100% to under 15% in 3 hours, and it needs 1.5A current from an external battery to charge successfully. The only way I know of curing this, short of experimenting with other telcos, is to tether to another phone via bluetooth (wifi is just as bad), but then that interferes with this Sony phone's ability to hold any other bluetooth connections.
I know that's a rant, but I just wanted to explain, that's why I've had to scramble to un-converge all the things I thought I could converge onto one phone. I'm bitter about convergence right now, I blame Sony, and if I were a professional troll, I'd say Sony made a lemon on purpose.