Nokia 1661 Guia Del Usuario página 22

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 with a hot or cold battery
may not work temporarily. Battery performance is
particularly limited in temperatures well below freezing.
Do not short-circuit the battery. Accidental short-circuiting
can occur when a metallic object such as a coin, clip, or pen
causes direct connection of the positive (+) and negative
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