Citizen CC1x Instruction Manual page 17

Charging your watch
Caution: This watch uses a special rechargeable cell.
• If the surrounding temperature falls below 0°C (32°F) or exceeds 40°C (104°F), the
"Charge suspension temperature detection function" will activate and charging will
not be possible.
• If you do not charge the watch for 60 days after it has stopped, the "Over discharge
detection function" will activate and charging will not be possible.
If the watch does not work even after charging for more than one day under direct
sunlight, request replacement of the rechargeable cell.
Fully charged to fully discharged: Approximately 2 years
(When receiving the satellite time signal once every two days)
Power reserve upon insufficient charge warning function (page 14): 10 days
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