The battery inside your WakaWaka Light is a high-temperature LiPo battery.
A solar powered device should be able to withstand the sun! That’s why we designed the WakaWaka Light to be capable of withstanding temperatures up to 80°C (175 °F) without problems. When it reaches higher temperatures, the internal system will shut down to protect itself. If this happens, best thing to do is to put it in the refrigerator to cool it down.
The LiPo battery cannot be charged when the temperature drops below freezing (0°C) so you won’t be able to charge your WakaWaka Light in these conditions. But between 0 and -20°C it can still be used as a flashlight.
However, please keep in mind that the battery performance will be temporarily degraded below freezing, the amount of energy available will be decreased compared to a use under normal temperatures (around 25°C).