Nokia 640 User Manual page 51

Notes for using the batteries:
• Use the battery only for its intended purpose.
• Never use any charger or battery that is damaged or worn out.
• Using the phone near the network's base station consumes less
power. The operation times are greatly affected e.g. by the signal
strength of the cellular network and the parameters set by the
network operator.
• Do not short-circuit the battery. Accidental short-circuiting can
occur when a metallic object (coin, clip or pen) causes a direct
connection of the + and - terminals of the battery (metal strips
on the back of the battery) 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 phone with a hot or cold battery may temporarily not
work, even when the battery is fully charged.
• The performance of NiMH batteries is particularly limited in
temperatures below -10°C (14°F).
• The performance of Li-Ion batteries is particularly limited in
temperatures below 0°C (32°F).
• Do not dispose of batteries in a fire!
• Batteries must be recycled or disposed of properly. They must not
be disposed of in municipal waste.
©2001 Nokia Mobile Phones. All rights reserved. 50
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