I purchased a Droid Maxx in March of 2015 with the distinct impression that I would not experience the typically short battery life of most smart phones. This has not been my experience. Instead, my battery is constantly getting hot to the touch and rapidly depleting. I do not run an excessive amount of apps, fewer than a typical user likely does. What is the cause of this? Is this something that can be taken care of under manufacturer's warranty? How difficult is the process?