CTA Digital Nintendo 3Ds External Power Supply and Charging Dock The Blue LED lights indicate the battery pack charge level. The Red light turns to green when the battery pack is fully charged. Have extra power for your 3DS when traveling. Integrated Stand for an optimum viewing angle. Specifications: 5 hours for a full battery pack charge. 2 hours to fully charge your 3DS. Built-in Battery capacity: 2000mah. Input: DC 5.0 V, 400mAh. Output: DC4.8 V, 800mAh.