Polysilicon solar panel 20% efficiency. NI-MH AA battery: 600mAh / 1.2v, this replacement top part has 1 bright warm white LED with 7 lumens. Please open the switch while charging, the switch is on the bottom. DIY absorbs solar energy during the day and automatically turns on at dusk. The solar replacement roof requires at least 8 hours of charging time. It lights up for 10 hours in summer and 5 hours in winter. Set of 2 replacement solar lamp tops , Size: 3.15 "x3.15" x0.78 ". Application: Perfect fit to various solar lanterns.Use for exchanging solar modules, for defective solar modules.