Dark Power Reserve

Solar watches need sunlight at regular intervals to function properly. However, if the watch is not charged for a longer period of time, the so-called dark power reserve comes into play. This varies depending on the watch model and can last from several months to years. The energy previously supplied in the form of light is then stored in the existing battery of the solar watch. To achieve a long power reserve, some watches switch off the time display. This means that the hands stand still, but the clock continues to run inside. When light falls on the watch face again, the hands automatically move to the correct position and the watch continues to run normally. Citizen's solar-powered watches are particularly known for their long power reserves in the dark. The watch manufacturer uses lithium-ion batteries that are continuously recharged. In this context, Citizen speaks of Eco-Drive technology, in which the dark power reserve is between 150 and 240 days. However, the brand also offers watches with a dark power reserve of up to 8 years.