WK
(
Cal.
VS21
)
Charging
Charging Method
- The watch charges when light hits the dial.
- To operate the watch when it is stopped or if the battery level is low, charge the watch in accordance with the estimated required charging time.
- There may be insufficient energy when you start using the watch. It does not have to be fully charged but make sure that it is adequately charged.
- If the second hand moves in 2-second intervals, charging is insufficient. Charge the battery until the second hand moves continuously in 1-second intervals.
> "Energy Depletion Warning Function"
CAUTION
Take care not let the body of the watch get too hot during charging.
> "For Safe Use > Precautions Regarding Quartz Watches > Secondary Battery" (opens new window)
Estimated Required Charging Time
| Illuminance (lx) | Light source | Environment | Required charging time | ||
|---|---|---|---|---|---|
| Full charge *1 | Continuous 1-second interval movement *2 | One day's operation | |||
| 700 | Fluorescent light | General office | - | Approx. 35 hours | Approx. 110 minutes |
| 3,000 | Fluorescent light | 30 W, 20 cm | Approx. 90 hours | Approx. 11 hours | Approx. 30 minutes |
| 10,000 | Sunlight | Cloudy | Approx. 30 hours | Approx. 3 hours | Approx. 8 minutes |
| 100,000 | Sunlight | Clear sky | Approx. 10 hours | Approx. 30 minutes | Approx. 2 minutes |
Charging for longer than the required time for full charge will not damage the watch.
The overcharging prevention function operates automatically.This is the time required to charge the watch from 2-second interval movement to continuous 1-second interval movement when a stopped watch is exposed to light.
If the charging time is too short, the second hand starts moving in 1-second intervals but may immediately revert to 2-second interval movements.
Charge in accordance with the estimated required charging time.
- The figures in the table are for reference only.
The actual required charging time may differ depending on the model.