Asus zenfone max pro is well battery back up.it have 5000mah.its huge nowadays, it is 6gb ram is very good compare to this price of mobile.the important thing in this mobile is display, its almost 6inch display plus full hd.i most loved its battery, I charged my battery once in day.asus touches is very smoothy, anyway it is best smartphone now.so please use it this.thank you.