Nitecore 21700 Intelligent Battery System battery, power bank and light

The Nitecore 21700 Intelligent Battery System is a battery, light and power bank in one. The 21700 i-series battery comes with two magnetic attachments: the surprisingly bright light and the power bank which is also the charger for the battery itself. You can easily click the attachments onto the battery, and you will immediately have an emergency light or a power bank close of no less than 5000 mAh. The great thing is that the entire system, including the storage box, only weighs 124 grams!