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Notes on Usage
■ Internal Battery
(The internal battery of the product is a
lithium-ion battery.)
The internal battery is not fully charged
at the time of purchase. Charge the
battery before using the product. If you
have not used the product for a long
time, you should charge the battery.
• Using the product in very hot or cold environments,
for example, when left in an automobile with the
windows closed in summer, will cause the internal
battery capacity to drop and shorten the available
battery usage time. This also shortens the internal
battery's service life. Try to use the internal battery
as far as possible at room temperature.
• After the internal battery is charged, battery power
decreases bit by bit even if the product is not
used. The internal battery may be discharged if the
product is not used for a long time. We recommend
to charge the product before use.
• Internal battery is a consumable item. If the
performance of an internal battery does not recover
(e.g. the usable time after each charge has become
extremely short), the internal battery is at the end
of service life, so stop use. Since the battery is
built-in, au Shop will keep the product and charges
will be incurred for repair. You may not use the
product for a certain period. Please be forewarned.
Note that the length of service life varies depending
on the usage condition, etc.
• Internal battery sometimes swells up as they
approach the end of its service life. This is due to
the properties of lithium-ion batteries, and is not a
problem in terms of safety.