Nokia N90 - Manual (Page 117)

Battery information
108
Battery information
Charging and discharging
Your device is powered by a rechargeable battery. The full
performance of a new battery is achieved only after two or
three complete charge and discharge cycles. 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.
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.
If the battery is completely discharged, it may take a few
minutes before the charging indicator appears on the display
or before any calls can be made.
Use the battery only for its intended purpose. Never use any
charger or battery that is damaged.
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 (-)
terminals of the battery. (These look like metal strips on the
battery.) This might happen, for example, when you carry a
spare battery in your pocket or purse. Short-circuiting the
terminals may damage the battery or the connecting object.
Leaving the battery in hot or cold places, such as in a closed
car in summer or winter conditions, will reduce the capacity
and lifetime of the battery. Always try to keep the battery
between 15°C and 25°C (59°F and 77°F). A device with a hot
or cold battery may not work temporarily, even when the
battery is fully charged. Battery performance is particularly
limited in temperatures well below freezing.
Do not dispose of batteries in a fire as they may explode.
Batteries may also explode if damaged. Dispose of batteries
according to local regulations. Please recycle when possible.
Do not dispose as household waste.
Nokia battery authentication
guidelines
Always use original Nokia batteries for your safety. To check
that you are getting an original Nokia battery, purchase it
from an authorized Nokia dealer, look for the Nokia Original
Enhancements logo on the packaging and inspect the hologram
label using the following steps:
Successful completion of the four steps is not a total assurance
of the authenticity of the battery. If you have any reason to
believe that your battery is not an authentic original Nokia
battery, you should refrain from using it, and take it to the
nearest authorized Nokia service point or dealer for assistance.