The battery is the most disappointing aspect of this phone (I think). My friend had a g4 and he would be down to around 70 by the end of the work day while I got down to 40. Pretty substantial difference.
Fortunately you can get larger batteries for it, 6500 capacity (PowerBear) or even 9000 capacity (ZeroLemon) on amazon. I prefer the powerbear because I can leave the metal sides visible and the weight is much less than with the ZeroLemon.
The second screen takes up very little battery the biggest offender is the main screen, keep the brightness low when you can don't jack the brightness all the way up.
Upgrade to marshmallow if you haven't already and use the program ForceDoze which aggressively puts your phone in Doze mode to save battery. Unfortunately you'll need to have adb sideloader experience or your phone rooted to use it.
There are a lot of things I like about this phone though:
- second screen is excellent for controlling music with the main screen on
- I can put shortcuts on the second screen for my fav apps for quick access.
- I can setup quick calls on the screen which allows me to quickly contact whomever I wish
- camera is fantastic
- the phone doesn't seem to get bogged down when I have a lot of apps installed, my note 3 did this.
- 64gb capacity
- the design is solid, some don't like how heavy it is but I think it makes the device feel solid. I especially like the metal rails on the sides it makes the phone stand out from other phones.
- audio quality is great with high end headphones
The only downs from my perspective is
- second screen could be brighter (fixed on the v20)
- battery life
- I miss the stylus from the note series
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