Kenneth Cheung/Getty Images Modern smartphones are as powerful as ever, and you’ll often see companies leaning on this fact as a way to sell you their new model. Almost every company is talking about how powerful its new phone is. But if you’ve used smartphones long enough, you know how battery life is a huge challenge. That’s why there are tons of articles on the web giving you tips on how to improve your smartphone’s battery life. If you feel that your phone’s ba...