The most obvious benefit of a solar charger is that it uses a renewable energy source, the sun, to provide energy to charge the battery, rather than using electricity from the grid. But apart from being ecological, there are other advantages. State-of-the-art Redding solar batteries for devices such as cell phones, digital cameras, and MP3 players are small and light enough to fit in a laptop or luggage bag. Apart from the initial cost, its main drawback is that it requires sufficient direct sunlight to provide sufficient power to charge the battery. First, it's cheaper after paying the price of the original charger: sunlight can still be used for free. Second, they are great for trips abroad because you don't have to worry about finding the right power adapter for the country or countries you want to visit. Luckily, most solar charger manufacturers have thought about it and include a power adapter to keep power working when the sun isn't available. Most stylish chargers for devices like cell phones and digital cameras are relatively compact when not in use, but can expand to display four or five flat surfaces with a solar panel mounted on top. This solar module contains photovoltaic (PV) cells made of semiconductors such as silicon that absorb sunlight and convert it into electricity. This energy is then stored and used to charge batteries or to provide emergency power to devices in an emergency.