@Wikiwide - I'd say your battery is dying... But my problem is a tad different - it started happening overnight.

@madry72 - http://pastebin.com/hhNUuZgP here's powertop. Interestingly enough my mmc is 90% empty. I will take it out and test battery life without it, but I've had it in from the begging. And it's only 2GB one.

But what seems odd is my today's (or rather tonight's) batterygraph slope... As I came home wasted out of my mind I didn't want anyone bothering me, but I'm not the turned-off-phone type of guy, so I've decided to set silent profile without vibration... And strangely enough slope was almost flat!