The one complaint we had about the HTC One last year was the battery life. It didn't seem to last as long as we needed or wanted it too. It did have a 2300mAh battery inside, which was the standard for batteries when it was released. However with the HTC One M8, HTC has bumped it up to 2600mAh. Which may not seem like a huge bump, after all it is only 300mAh change. But with the Snapdragon 801, battery life should be better and the device should charge a lot quicker as well. HTC is claiming that the HTC One M8 lasts 40% longer than the HTC One M7, which is a pretty big deal, that's nearly double what the HTC One lasted.
The HTC One M8 also has a power-saving mode much like the Samsung Galaxy S5. In which HTC says the device can last about 2 weeks in standby mode. Which is pretty spectacular. And that means that standby is pretty good on the HTC One M8, which is good for those that don't use their phones every minute of the day. At 20% HTC says it can last 60 hours, at 10% 30 hours, and at 5% it'll last 15 hours. That's just crazy talk right?
It's great to see companies like HTC and Samsung working on battery technology, because that's where I think they all need to be working. As every other aspect of the smartphone is fantastic, until you get to the battery life. None of us like having to charge our device multiple times a day, am I right? and you didn't buy your phone to let it sit there and not get used all day either so you can keep from having to charge it throughout the day. Hopefully they'll be able to catch up to the likes of LG and Motorola with their battery technology pretty soon. As I think those two are leading the way right now.