Casio G-Shock GSW-H1000 User Manual page 115

Charging
The watch and AC adaptor may become warm to the touch during charging.
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This is normal and does not indicate malfunction.
Do not charge the watch while its charge level is high enough for watch
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operation. Waiting until the charge level is low until you charge will help to
extend battery life. Disconnecting the charger cable from the watch after it
reaches a full charge is recommended. Any of the following can hasten
battery deterioration and should be avoided.
Frequent charging while the battery is fully charged or near fully charged
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Continuing to charge over a long period (multiple days)
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Connecting and disconnecting the charger cable multiple times during a
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single day even though the battery is fully charged
Do not charge the watch if the watch or charger cable is wet. Wipe off all
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moisture and make sure the watch and charger cable are dry before
charging.
Do not charge the watch in a location where large amounts of moisture,
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dust, or fine metal particles are present, in a location subjected to vibration,
or near a hard line telephone, a TV, a radio, etc.
The charger cable of this watch is magnetic. Contact with sand containing
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iron particles can make it unusable for charging. Should the charger
terminal or cable become soiled with mud or sand, thoroughly wipe off all
foreign matter before charging.
In an area where it is extremely cold or hot, you may not be able to charge
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the watch or the watch may not charge completely. Charge the watch in an
area where the ambient temperature is between 10°C and 35°C (50°F and
95°F).
EN-114