Battery Life: 4:36
Cost Per Hour of Juice: $10.70 per hour for T-Mobile, $65 Unlocked
If you want a pure Google experience, the unlocked Nexus 4 is the smartphone to buy. You get the latest Android 4.2 Jelly Bean software, a nifty Photo Sphere camera and absolutely no ugly skins. Too bad the 2100 mAh battery inside this handset lasted only 4 hours and 36 minutes on our battery test. Even when you consider the cheap, limited-time-offer price of $49, you’ll still have to deal with a device that lasts 1.5 hours less than the average Android phone. The $49 HTC One VX lasted 6:58 on our test, good for a $7 per hour efficiency rating.