General :: I9300 Extreme Battery Drainage And Overheating

Before I entered the world of custom ROMs, my i9300's battery was fine. However, when I flashed my first custom rom months ago (CM10.1 nightly), my battery would drain from 100% to 0% in around four or five hours. This was only on light to moderate use, with a bit of Web browsing and Kindle. GPS and mobile data are almost always both off, other than when I need them, and brightness is set at the lowest possible 90% of the time. I checked my battery usage in the settings and there was no evidence of the renowned mediaserver cause of battery drainage, so I'm not really sure what the cause is.

Also, a few days ago my phone began reaching extreme temperatures when I executed any operation on my phone. At the moment I am typing in xda only and my battery is at 111 degrees. I noticed that it began with a certain nightly of Carbonrom and Temasek kernel.

I have done numerous factory resets and flashed different ROMs and even gone back to stock and fully unrooted, but the problem persists.