Nokia 1661 User Manual page 23

The battery can be charged and discharged
hundreds of times, but it will eventually wear out.
When the talk and standby times are noticeably
shorter than normal, replace the battery. Use only
Nokia approved batteries, and recharge your battery
only with Nokia approved chargers designated for
this device. Use of an unapproved battery or charger
may present a risk of fire, explosion, leakage, or
other hazard.
If a battery is being used for the first time or if the
battery has not been used for a prolonged period, it
may be necessary to connect the charger, then
disconnect and reconnect it to begin charging the
battery. If the battery is completely discharged, it
may take several minutes before the charging
indicator appears on the display or before any calls
can be made.
Always switch the device off and disconnect the
charger before removing the battery.
Unplug the charger from the electrical plug and the
device when not in use. Do not leave a fully charged
battery connected to a charger, since overcharging
may shorten its lifetime. If left unused, a fully
charged battery will lose its charge over time.
Always try to 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
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