Please fully charge the solar panel light in the sunshine before using it - Working power will be influenced by weather, location, etc. - If you don't use it for a long time, please fully charge it in the sunshine every 3months. It's better for battery life. - Please don't turn over and fold the solar panel too hard and so frequently - Please install the solar flood light in a location that the light gets the sunlight directly without any shelter. - If there is no good sunshine or in winter, it takes more time to charge. Specifications: Solar panel: 5V 2W Max Li-ion