With today's technology advancing at such a fast rate, there has been one thing left in the past... Sure there has been minor updates to batteries, but these things have been around for ages. Put into perspective the cell phone and how advanced they have become in such a short time. The iPhone first launched in the United States in June 2007. It's hard to believe that was just over 7 years ago.... We have hit a time where smartphone screens are pushing 1080P, and even 4k! The internal specs are simply astounding, an octa-core in a phone? Who would have ever thought. With all the advancements it has pushed the battery to it's limits. I would have to say the single most complained about thing on a phone these days? Battery life. They are always trying to push the limits on phones these days, and at the same time trying to cram in the largest battery they can into the ever slimming devices. There are a few phones that will last all day with fairly heavy usage, but those...