LuminAID lights all have a high-efficiency monocrystalline solar panel that recharges the built-in battery when exposed to direct sun. To recharge your light, place the light in direct, outdoor sun with the solar panel facing the sun. Windows block light and significantly slow down charging. For optimum charging, place the light outside in an area away from shadows or shade. Charge times vary depending on time of year, location, and product. For detailed information, refer to the Charging section on the How it Works page.