Casio G-Shock GSW-H1000 User Manual page 10

Charging
Use only the prescribed method for charging.
Use of a charging method other than the method specified for this
watch creates the risk of heat generation, fire, and explosion.
Rechargeable Battery
Do not try to remove the rechargeable battery from the
watch.
Doing so creates the risk of heat generation, fire, and explosion.
If the rechargeable battery is ever accidentally removed from the
watch, take care to ensure that it is not swallowed. Special care
is required when young children are present. Should a battery
ever be swallowed, contact a physician immediately. Swallowing
a battery can rapidly cause chemical burns, mucosal tissue
penetration, and other serious problems that create the risk of
death.
Always request rechargeable battery replacement from a
CASIO Service Center or your original retailer.
Use of a non-specified type of battery or improper replacement
creates the risk of battery overheating, fire, and rupture.
Danger
EN-9