4.4.2 has a lot of bugs, the worst power draining bug is the camera app. A factory reset does not help. The best is to go into app manager and manually force close the camera and other apps triggering the camera. If you have apps like Skype etc. that triggers the camera app, the best is to uninstall it. Android has released a fix, 4.4.3, where they fixed thirty something bugs but as far as I know only available for Nexus at this point. How long it takes for other phones to get it depends on the carrier and what phone you have. Do not try to go back to 4.3, there is a big risk of bricking your phone, (most likely you will) .
A factory reset will not solve the power consumption caused by the camera app. Also, it does not help with another camera app since it is impossible to uninstall the stock camera app that is the one triggering the bug. Here is some info. A lot more info. is available on the net, just google.
KitKat giving you battery drain problems? Try uninstalling Skype, says Google as it prepares a fix | ZDNet
Other known bugs are random disconnect WiFi and phone calls, random restarts, apps not working properly. I understand that uninstalling and reinstalling those apps helps, sometimes.
I found that shutting of the phone when charging and force close the involved apps when starting it somewhat helps on the power drain. Had I known this, I would never have updated to 4.4.2. My 4.3 was perfect and now with 4.4.2 it is a total mess. I also use Skype, but it drains the battery like pouring out a bucket of water. So does everything else involving the camera. Worst of all, there is no way back.
Hopefully 4.4.3 will be released FOR ALL PHONES involved, SOON!!