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You can charge your smartphone together with your friends during a weekend trip or at a festival extra fast with the compact BlueBuilt Power Bank with Fast Charging 10,000mAh Duo Pack Black. These power banks have both Power Delivery and Quick Charge fast charging. That means that you can charge iPhone models and Samsung smartphones, and most other Android devices extra fast. After half an hour of charging, your empty battery is charged for 40 to 50%. With a cheaper, slower power bank, you'll get to 20% in the same time. Fast charging is useful if you need to charge before you enter the festival terrain. These compact power banks are easy to take with you in your bag or pocket. You can fully charge your smartphone about 2 times. Cables for Android smartphones and the iPhone 15 are included, but you need an extra USB-C to Lightning cable for your iPhone 14 or older. This BlueBuilt power bank has a 5-year warranty.