Never run out of power again with the 16,000mAh Solar Power Bank from ToughTested. This portable battery pack features a built-in solar panel and is IP67 rated to be dustproof, shockproof, and waterproof. With a 16,000 mAh capacity, it can fully recharge most smartphones five to six times. Also, it has two USB Type-A ports so you can charge two mobile devices simultaneously. When it's low on power, you can recharge it simply by leaving it out in the sun or by connecting a micro-USB cable to a computer or wall charger. Other features include built-in power indicators and a flashlight, which can come in handy in emergency situations.