I got up for work at 3:15AM and my phone battery hasn’t even been touched. the battery case isused first and then it pulls from teh phone. It feels great, ioffers great protection and gets you through a couple days of heavy use without having any battery drainage anxiety.
Here’s the link to purchase: https://amzn.to/2YIsmE1
Here’s a screenshot of my usage at 12:30PM after 9 hours of usage.