These portable chargers and power banks give you the most boost when you're out of juice. I’m a Mobile Analyst at PCMag, which means I cover wireless phones, plans, tablets, ereaders ...

French airlines Air France and Transavia, for example, authorize the carriage of external batteries or power banks in the cabin, subject to certain conditions. However, it is strictly forbidden to ...

There’s how much power your power bank can hold, how fast it charges your device, and the number of ports. Usually a high-capacity power bank will let you charge your device several times ...