Nikon KeyMission 360 Quick Start Manual page 70

Discontinue use immediately should you notice any changes in the
batteries, such as discoloration or deformation. Cease charging if they do
not charge in the specified period of time. Failure to observe these
precautions could result in the batteries leaking, overheating, rupturing, or
catching fire.
Prior to disposal, insulate battery terminals with tape. Overheating, rupture,
or fire may result should metal objects come into contact with the terminals.
Recycle or dispose of batteries in accord with local regulations.
If battery liquid comes into contact with a person's skin or clothing,
immediately rinse the affected area with plenty of clean water. Failure to
observe this precaution could result in skin irritation.
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Introduction
For Your Safety