Power Supply: Solar cell and one rechargeable battery
Approximate battery operating time: 6 months (from full charge to Level 5 (CHG)) under the following conditions:
•Watch not exposed to light
•Internal timekeeping
•Display on 18 hours per day, sleep state 6 hours per day
•1 illumination operation (1.5 seconds) per day
•10 seconds of alarm operation per day
•4 minutes of signal reception per day
Frequent use of illumination runs down the battery. Particular care is required when using the auto light switch (page