Macworld For those of us who are always on the go and always on our phones, having a portable power bank is essential. The Anker Magnetic Power Bank is not only a fantastic solution, but it’s also on sale for its best price yet, down to $31.49 from its MSRP of $40. Picture this—you’re out and about, you’ve been scrolling through social media all day, taking calls, playing some games, and your battery is already low enough that you know it won’t last those few hours until you reach home. Plugging in your phone isn’t always an option, so the Anker Magnetic Power Bank will definitely come in hand…