SunJack USB Battery Charger for Rechargeable AA/AAA Size Ni-Mh/Ni-Cd/Alkaline/LiFePO4 Batteries RECHARGES AA AND AA Ni-Mh/Ni-Cd/Alkaline/LiFePO4 BATTERIES from most USB power sources: USB battery banks, most cellphone USB chargers and laptops. Works well with SunJack 10000mAh Quick-Charge Battery. PERFECT FOR HOME AND ON-THE-GO USE: Perfect to have at home for all those battery-powered items around the house. Then, take it with you On-The-Go. Great for camping, travelling, the beach, emergency-preparedness kits and many more outdoor activities. Use it with a SunJack Solar Panel and SunJack batter pack to have re-charging capabilities even in remote areas with no electrical outlets. SMART CHARGING: Each battery is monitored and charged to capacity separately. Mix and Match different batteries in the same charge. Individual LED indicator lights turn from red to green when each battery is fully charged. FAST & EASY: 1A charge rate charges most Ni-Mh AA batteries to capacity in 4-5 hours without overheating. You can be using that toy or tool quickly without having to search for or buy new batteries. SAVES MONEY AND THE ENVIRONMENT: Using rechargeable batteries helps save the environment of old, worn-out batteries and saves you the cost of continually having to buy new batteries.