Credit: INIUWhether you’re planning a long day of travel or simply forgot to charge your phone overnight, there are situations where a portable power bank can be a game-changer. Most power banks solve the battery problem, but create a new one: bulk. Depending on the capacity you need, these can be heavy and inconvenient to carry around, and might not even be travel- or airline-friendly.That’s the concern INIU is addressing with its Pocket Rocket P50 power bank. It boasts a 10,000mAh capacity, weighs just 160 grams, and is small enough to comfortably slip into your pocket. And for its Spring Sale, INIU is offering discounts of up to 30%. Here’s what you need to know.