What’s the best way to make sure your phone always has power, no matter where you are or how many YouTube videos you watch? Carry a portable charger (also known as a power bank) with you! And if you still don’t have one, here’s a great opportunity for you: this Baseus portable charger is on sale for just $15 on Amazon. The catch? That price is for Amazon Prime members. (Non-Prime members can grab it for $19, which is still a great price!) This power bank is slim and light — about the size and weight of a phone — so it’s enough to carry with you anywhere you go. It’s fast enough to recharge 50%…