Brunton #Metal-YL Metal 4400 Power Pack AC/USB Charging Device, Yellow Brunton Product Includes battery Great for camping Compact and Lightweight Design with Adventure Armor; Machined Aluminum Housing for Extreme Durability and Rugged Performance LITHIUM ION ENERGY - High-grade Lithium ION cells charge faster and last longer; no memory and minimal discharge; 1000 cycles at 80% capacity CHARGE TIME - USB - 4 hours; SOLARIS 4 (not included) USB - 5 to 6 hours Dual Charge output; Twin USB Outputs, Charge Multiple Devices Simultaneously Planet Safe Power/High-Yield Lithium Cells Keep Wasteful Alkaline Batteries on Shelves and Out of Landfills