During storage, lithium batteries will slowly discharge, but should remain usable for a long time. Our lights’ adaptive capability will recharge a discharged battery in most circumstances by simply installing our light in a sunny location. When you connect the battery, you will see one of three scenarios, the light illuminates on for about 20 seconds, indicating a high charge level, the light flashes three times, indicating a low charge level, or the light does not illuminate. If you see either the steady illumination or the flashes, the light will easily charge itself in the bright sun. If the light does not illuminate at all, the battery is likely very low and may need recharging. Contact us for assistance in this case at 1-844-279-8754.