37
Before Using the Handset
Cautions while charging
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For details on the estimated charge time and battery life when
fully charged
☞
P. 200 “Main specifications”
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The battery can also be charged with the handset turned on
(While charging, the battery icon appears with [
]
superimposed).
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Do not charge for a long time with the power left turned on. If the
handset is left turned on after charging is complete, the internal
battery charge level decreases.
In this case, an AC or DC adapter (sold separately) charges the
battery again. However, depending on the time when the handset
is disconnected from the AC or DC adapter, the battery charge
level may be low or the battery may only be usable for a short
time.
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If the handset is left for a long time even after the charging is
completed, the battery level may decrease.
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When the battery is empty and the handset is being charged, the
charging lamp may not illuminate immediately. However, charging
is in progress.
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If the battery empty alert is displayed and the power cannot be
turned on, charge the battery for a while.
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While charging, the handset may not be turned on even when
the charging lamp is illuminated in red. Charge longer and try
turning the power on again.
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Frequently recharging the battery when its power is still
remaining enough may shorten the usable life of the internal
battery. It is recommended to use the battery to a certain level
(e.g. after the battery level decreases) before recharging.
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When the battery becomes warm, charging may automatically
stop even if the battery has not been fully charged. Charging
automatically resumes after the temperature lowers to an
appropriate temperature.
Internal battery usable life
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Internal battery is a consumable product. Battery life per charge
is gradually reduced every time the battery is charged.
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When battery life per charge is reduced to approximately half of
the default time, this means that the internal battery is
approaching the end of its usable life. In this case, it is
recommended to replace the battery as soon as possible. For
details on replacing the internal battery, contact the number
listed in “Repairs” (in Japanese only) on the last page or a repair
counter that DOCOMO specifies.
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If you watch video etc. while charging for a long time, the usable
life of the internal battery may become shorter than estimated.
Charging with AC adapter
When charging the battery with AC Adapter 06 (sold
separately), operate the following steps.
1
Insert the Type-C plug of the AC adapter
horizontally into the USB Type-C connection
jack on the handset
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