Step-by-step checks for light exposure, charge level, and when the secondary battery needs attention.
1. Expose the dial to strong light, not just room light through a sleeve.
2. Charge longer than a few minutes if the cell is deeply discharged.
3. Avoid assuming any light source is equal — daylight is usually strongest.
4. If it restarts after light, keep topping up for several hours.
5. If strong light does nothing, the secondary battery or circuit may need service.
Brand manuals differ on exact charge times and warning displays. Use this as a practical first path, then check your model guidance.
Why is my Eco-Drive not charging?Common causes are insufficient light, long storage discharge, blocked dial exposure, or an aged secondary cell.
Can indoor light charge a solar watch?Sometimes slowly. Strong daylight is usually much more effective.
How long should I charge it?If deeply discharged, think in hours of good light, not minutes.
When does the secondary battery need replacement?If it no longer holds a charge after proper light exposure, service is the next step.