The Asus Zenfone Max is a beast smartphone when it comes to battery, the phone itself is very heavy due to its 5000mAh monster battery!
You can almost last 3 days with normal usage on this phone.
The phone features Android marshmallow by default.
What I love about this phone was that it has a 2.5D gorilla glass 4 display which is very attractive to the eyes.
However, the only thing which I don’t like about the phone is that the UI is very laggy compared to Asus’s other phones. Maybe they fix it with a update in the future
But, overall - good phone for the price!