We were impressed when Samsung stuffed a 3,600 mAh battery into the S7 Edge — after all, that phone lasted more than 10 hours on our battery tests. But now Acer is upping the ante with its new Liquid Zest which features a massive 5,000 mAh battery in a similar 5.5-inch design. The difference? Acer’s new phone will cost a third of what you pay for an S7 Edge.