How do I smite this unknown vampire process that is sucking the blood out of my battery? I have a Samsung Galaxy S2 that I upgraded to 4.4 a couple of days ago. Since upgrading, my battery longevity has dropped a crazy amount. Just this morning, it took about four hours to go from full charge all the way down to about 25%, and that's without much use. Previous to upgrading, I could go for about two days while listening to podcasts and writing emails and general normal use.

I looked in the system settings under the battery usage, and discovered that some "unknown" process was responsible for 50% of my battery use:



I clicked on the process to see if I could kill it, but the option to "force stop" was greyed out:



I tried rebooting, but, near as I can tell, it's still there, eating my battery.

How to I put a stake in the heart of this vampire process and make sure it never returns?



Update: More battery madness.

Yesterday, I woke up and my battery was dead, even though it was left in the charger for the night. Took a few rounds of trying to recharge and reboot to get any response, but eventually I got it running again, and this is what I saw in the battery settings:



Looks kind of like Google+ threw a fit and sucked the life out of the battery. Though, actually, I think that's probably a misreporting of events.

Okay, so then, yesterday, I was listening to a podcast, and I hear a pop and then my phone reboots. Again, when it's back on, I check the battery report:



It's pretty normal for the screen to be the biggest battery draw, but I don't see why suddenly the available battery power droped by about half at the time the phone self-booted.

So... I don't really know what to make of any of this. I'm kind of thinking maybe my battery is dying and behaving oddly. But if anyone has any better ideas...?
If you are rooted, I would recommend downloading Better Battery Stats (or Wakelock Detector) from the Google Play Store, and finding the name of the 'mad' processes.

If you aren't rooted, I recommend you root as other apps can't access battery stats as of Android OS version 4.4.