A **solar panel charger** is a portable device that converts sunlight directly into electrical energy to power or recharge batteries in electronics like smartphones, tablets, and cameras. Composed of integrated photovoltaic cells, these chargers capture solar radiation and utilize an internal controller to regulate voltage, ensuring a safe and steady flow of power to connected devices. They are highly valued by outdoor enthusiasts and travelers for providing a renewable, off-grid energy source that reduces reliance on traditional electrical outlets while minimizing environmental impact.