Yamaha NAVIGO Owner's Manual page 64

● If you mishandle either of these batteries or their chargers, it may result in heat generation,
rupture, electric shock, or injury. Be sure to adhere to the items below.
Do not insert the cords or
other items into the Nickel
Metal Hydride battery sock-
et.
If the battery or the charger is deformed or has an unusual odor, or if you notice any other
abnormality, do not use the battery or charger.
When inserting or removing the lithium ion battery, be careful not to pinch your finger with
the grip.
Avoid prolonged contact with the skin.
It is normal for the charger to heat up while it is charging. Therefore, prolonged contact
with the skin may result in a low-temperature burn injury.
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WARNING