Everyone knows otherwise rational people who live in total terror of their smartphone running out of juice. This year, give the gift of a stylish, convenient, and effective solution: the BOLT Portable Power Adapter. An all-in-one wall charger and backup battery, it puts dead-battery fears to rest for good. Here's how it works: When plugged into an outlet, the adapter charges its own internal battery, even while charging the device you connect to it with a USB cord. Once removed from the wall, the compact, minimalist BOLT then becomes a highly portable backup, ready to provide power to your mobile device whenever it starts to run low. Available on Amazon; $49.98.