Large Solar Backpack Panel Fast charging  The Solarrific 5W Solar Backpack Panel will charge a typical cell phone with a 3.7V 1020mAh lithium battery in 2 to 3 hours in full direct sun Emergency  Provides an emergency power source for small electronic devices where there is no access to electricity Portable  Light weight and easy to pack for both travel or emergency preparedness Versatile  Attaches to any outdoor gear or let it stand on its own or use suction cups to place it on a glass window or in your car The Solarrific Large Solar Charger for Backpack panel will charge mobile telephones, digital cameras, MP3 players, iPods and a host of personal communication devices