This power bank not only offers 10,000mAh capacity, but it’s solar and has a waterproof case which make it an ideal inclusion for camping, sports, outdoor activities, or just another handy way to charge your device…and the rubber casing is perfect for those annoying drops we all punish our devices with occasionally. So, load up anywhere the sun shines, and charge away! Can charge an iphone 6 up to 100%-only needing 3 – 4 hours. Also uses the new lithium polymer cell; known for its long charging life and efficiency….(another reason really). The solar panel on these units are small but ideal to put a little charge into the unit in emergencies when you have completely drained the battery. Ideal for emergency use if away from power and you need to make an emergency call and your battery is dead.