5 hours of Screen on time (SOT) or 5 hours of use, period? if the latter, you have a defective unit.
For what it's worth, I think this phone has great battery life. It lasts me all day, and that's all I care about. I don't compare SOT values because I never get good SOT. I regularly get 3.5-4 hours of SOT during a day but I get ALL day battery life which is exactly what I want. The phone gets unplugged around 630am and goes until 10-1030 when I plug it back in at night. I usually have 15%-20% battery remaining at that time. This phone is the first android phone I've had that gets me all day battery life.
And I don't have anything really turned off. I have auto brightness on, Bluetooth on (synced all day to my LG Watch Sport), NFC, Location, etc. all turned on