Are you always on the move and need a reliable way to keep your phone, earbuds, and other devices charged? A good power bank is the ideal travel companion, ensuring you’ll never run out of battery. And if you need a power bank, good news: the Anker 313 PowerCore 10K is now available for just $18 at Amazon, a superb price for an everyday gadget that’s so useful to have on you. At 10,000mAh, the PowerCore 10K can fully charge a modern powerhouse phone at least one full time, while older phones with less capacity might even get two complete charges. It comes in super handy when your phone’s batte…