No scenario kills a smartphone's charge faster than travel, when you're likely to rely on the device for navigation after using it on the plane for entertainment. The 8.1-ounce Anker Astro 3E external battery is barely larger than your phone but has enough juice to recharge it four times. [$30; ianker.com]
Powered By ZergNet
Sign up to receive the Men’s Journal newsletter and special offers from MJ and its marketing partners.