5 ways to extend the HTC One M9's battery life

The HTC One M9 is a joy to have, but it's not a smartphone that can easily last you through 8 hours of enthusiastic use. Thankfully, there is a good number of ways to ensure your metallic friend gets you through the day, or in the worst case scenario, provides precious minutes of functionality when its battery percentage hits single digits. The easiest one is to get an ample battery pack, of course, but these aren't always convenient and do nothing to make the HTC One M9 less power hungry. So, here are five things you should consider in order to improve the flagship's battery life from the inside.