How to Replace a Citizen Capacitor

Citizen’s Eco-Drive watches are renowned for their solar technology, which charges a rechargeable energy cell rather than a traditional disposable battery. These rechargeable cells, often referred to as “capacitors,” store solar energy to keep the watch running. Over time, the capacitor can lose efficiency and may need replacing. For watchmakers and hobbyists alike, knowing how to replace a Citizen capacitor is an essential skill. In this guide, we’ll walk through the process, highlight the tools you’ll need, and provide tips to ensure a successful repair.

Signs a Capacitor Needs Replacing

  • The second hand jumps in two-second intervals, a low-power indicator.
  • The watch stops running shortly after being exposed to light.
  • Charging takes longer than normal, with limited power retention.
  • The capacitor is older than 8–10 years.

Identifying the Correct Capacitor

Each Citizen watch movement has a calibre number engraved on the case back. Use this number to find the exact replacement capacitor. Never substitute a standard silver oxide battery - Eco-Drive movements require specific rechargeable cells.

Step-by-Step Replacement

  • Open the Case: Secure the watch in a case holder and use the correct opener. Take care not to scratch the case.
  • Remove the Movement: Depending on the model, gently lift the movement from the case or work with the back open.
  • Locate the Capacitor: It will be held under a retaining clip. Carefully release the clip without bending it.
  • Replace the Capacitor: Using plastic tweezers, remove the old capacitor and install the new one in the same orientation.
  • Reassemble the Watch: Replace the clip, reinstall the movement, and check the gasket. Replace the gasket if damaged.
  • Close the Case: Secure the case back, ensuring it is properly tightened.
  • Charge the Watch: Place the watch in sunlight for several hours to fully charge the new capacitor.
  • Reset if Required: Some models need an “All Reset” or “AC reset” after capacitor replacement. Refer to the movement’s technical guide.

Replacing a Citizen Eco-Drive capacitor is a straightforward task with the right tools and care. It restores a watch’s functionality and extends its lifespan, making it a cost-effective and sustainable repair.