Solar-Powered Backup Battery Pack with 5000mAh Lithium Battery - Rugged rubberized exterior. IPX4 splashproof. 5V 2.1A USB out to charge most smartphones and tablets. Slim design. Fastener holes for backpacks and straps. Rechargeable lithium battery (5000mAh) - enough to charge most smartphones two and a half times. Removable - Interchangeable battery pack. Battery packs sold as accessories. Press button for LED battery charge indicator. Micro-USB to charge via smartphone charger. 7 hours for full charge. Solar charging. 30 hours for full charge. Black.