Tech4O solar panel battery chargers can charge 2 or 4 AA or AAA batteries in just a few hours. Need to charge your batteries in a remote location? All you have is sunlight? A solar powered battery charger is a great addition to your outdoor adventure gear! Both the SC44 and SC22 solar panel battery chargers are built to be extremely lightweight, durable, and portable. Never be without power for your AA or AAA batteries with a Tech4O solar panel powered battery charger.