A mobile device with a drained battery might as well be paperweight. Power your iOS, Android, or any USB-compatible devices with Solar Juice by ZeroLemon. This small, lightweight battery pack offers a massive 20,000mAh of portable power to recharge your devices over and over again. It’s built-in Lithium Polymer battery can be easily charged by plugging it in any wall outlet, or in case of emergency, by catching some rays.