Battery Drain topic

I am using an s4 charger, and the phone won't charge past 15% since the OTA 4.3. What is the best option to keep my data? I have seen all the downgrade procedures but they involve wiping. Any hints on what processes are causing this drain? Just to catch you all up, I am a veteran root/phone user, no need to ask if NFC or other BS is on, just uncommon apps or processes that are new to the 4.3. Is anyone in the know about when ATT with fix this atrocity of a ROM? And with the KNOX BL is there a way to flash back to 4.1.2 BL and then get onto a custom ROM? I got away without touching this phone ROM wise until this minute, I can't even charge it via USB...