Citizen Eco Drive watches run on sunlight. It is imperitive that they are exposed to natural light or lamp lights that have the full spectrum of light. When they are exposed to light the capacitors store energy to keep the watch running properly during night-time or non-lit hours. You can find a selection of capacitors for Citizen Eco Drive watches. We carry the batteries for Citizen Promaster, Blue Angel, Echo drive Pilot wattch. You can always contact us to find out the correct capacitor for your Citizen watch.