Universal solar cell phone chargers come in several forms. The most common are portable solar panels that have connectors through which energy flows to your cell phone battery. Other cell phone battery chargers are those that come in the form of straps wherein solar panels are installed on the outer surface. Within these straps are nickel metal hydride batteries.
Six hours of exposure to direct sunlight can fully recharge your mobile phone. The charge can last up to 40 hours of talk time. And because of it