Solar Batteries 4Pk. Ni-MH, 600mAH. Compatible to Solar Lights with 1.2V AA Ni-MH First Time Use: Place the solar light in a position where it will be exposed to the sun for at least 48 hours period to fully charge the battery. During the day the solar panel uses sunlight to recharge the battery. At night, the lights turn on automatically. Operating time depends on the geographical location. In winter, lights will not receive as much sunlight and operating time will decrease. 8 hours of direct sunlight per day will fully recharge the solar light. Do not place solar panel in shady areas.