Someone bought a T-Mo LG G Flex yesterday and accepted the kit kat update, he's had to put it on the charger THREE TIMES in only a day. Mine is on Sprint CDMA and goes two days with Knockon or 3-4 days without Knockon.
Android System is tied with Idle and Standby at FOUR PERCENT. OS is 18%, Screen is 24% and Opera browser is 39%. I should see if this site has a dark color theme, due to p-oled my dark mode ebook reading drops the screen to only a few percent.
The thrust of this is that I sympathise and will be skipping 4.4.2 on my device if I can.