Originally Posted by Andish
Well when I went to bed it was at 100% charge. 87% on waking up (~8.30). I checked my mails, and browsed the net a bit (~9.00) it was at 56%
I fiddled around in google services. I didn't check it after flashing. Some stuff were checked by default. Will see how goes.
I've been running into similar issues, and doing a battery calibration seems to have helped me (so far). My phone would use battery quickly and also shut off without warning. I have used the option to "Reset Fuel-Gage Chip" in STweaks when running Siyah Kernel, but since I'm using SuperNexus 3.0 (not sure if I can use Siyah Kernel with it), I downloaded an app off the play store last night simply called "Battery Calibration". I'm still letting the battery drain completely so I'm not sure how well it works yet. Apparently it just deletes the batterystats.bin file.
After running the Fuel-Gage reset on my previous ROM, my phone no longer shuts off without warning. It would start to flicker the screen, kill the data, and then shut off with plenty of battery left according to the OS.
Doing this may hopefully help you as well, since you've been switching ROM's.