Plug Should I exchange this note 3 for this pathetic battery life?

Wifi, sync, gps are all off for most of the time. Power saving mode is always on.
I am only getting 2.5 hours of screen on time. Just Web browsing, no games.
Android OS is taking 46% of the battery, which had been the case for a week now. I factory reset the phone 3 times already not it didn't change anything.

I installed a battery monitor app few days ago, find out that under android os, something called w1_bus_master is the main cause but I can't get any info about it.


Maybe the weak 3g signal keep draining the battery? But if I turn off the data at night and kill all the process and the battery only drop 3%.


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