Gone are the days when you'd be worried about whether your smartphone or tablet can run an app or game. These days, you're more worried about whether your devices will last long enough for you to get home and plug in. Battery technology hasn't exactly progressed by leaps and bounds unlike other smartphone components. And, aside from hoping for bigger batteries or using power packs in an emergency, users are left with no other option than to make sure that their devices aren't consuming more power than absolutely necessary. Luckily for us, Baidu's got our backs with DU Battery Saver.