Nokia BH-310 Manual page 12

Bluetooth mono headset
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The battery can be charged and discharged
hundreds of times, but it will eventually wear
out.
Talk and standby times are estimates only. Actual
times are affected by, for example, device
settings, features being used, battery condition,
and temperature.
If the battery has not been used for a long time,
to begin charging, you may need to connect the
charger, then disconnect and reconnect it.
If the battery is completely discharged, it may
take several minutes before the charging
indicator is displayed.
When your charger is not in use, unplug it from
the electrical plug and the device. Do not leave a
fully charged battery connected to a charger, as
overcharging may shorten the battery's lifetime.
If left unused, a fully charged battery will lose its
charge over time.
Always keep the battery between 15°C and 25°C
(59°F and 77°F). Extreme temperatures reduce
the capacity and lifetime of the battery. A device
with a hot or cold battery may not work
temporarily.
Do not dispose of batteries in a fire as they may
explode. Dispose of batteries according to local
regulations. Recycle when possible. Do not
dispose as household waste.
Use the charger for its intended purpose only.
Improper use or use of unapproved chargers may
present a risk of fire, explosion, or other hazard,
and may invalidate any approval or warranty. If
you believe the charger is damaged, take it to a
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