Seiko 6M25 Instruction Manual page 25

WARNING
Do not remove the battery from the watch.
If it is necessary to take out the battery, keep it out of the reach of children.
If a child swallows it, consult a doctor immediately.
Never short-circuit, tamper with or heat the battery, and never expose it to
fire. The battery may burst, become very hot or catch fire.
CAUTION
The battery is not rechargeable. Never attempt to recharge it, as this may
cause battery leakage or damage to the battery.
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