Working Time: Replacement Solar Lights - Up to 8-10 hours charging time, over 10 hours running time. Replacement: These solar light covers are designed to replace defective solar panels. The solar lamp replacement cover is compatible with various solar lamps. Size: Includes 4 spare solar lights, each 8 cm in diameter. Each unit features a 25% efficiency polysilicon solar panel and a 600 mAh / 1.2 V Ni-MH AA battery. Lighting: Warm white LED provides reliable night lighting. Usage: This replacement light cover includes a switch on the bottom; turn on the switch during charging. The light operates automatically, turning on at dusk and off at dawn, functioning as a solar light or solar garden light. Suitable for use with various solar lanterns. Note: All measurements are manually taken; please allow 1-3 cm variation. Due to lighting and display differences, actual color may vary slightly from the image. Product received may differ slightly in appearance.