Nokia 3390 - Manual (Page 125)

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Do not short-circuit the battery. Accidental short-circuiting can occur
when a metallic object, like a coin, a clip, or a pen causes a direct connection
of the + and - terminals of the battery, which are metal strips on top of
the battery.
An example of short-circuiting could occur if you carry a spare battery in
your pocket or purse, where the battery could come into contact with
objects such as a coin. Short-circuiting could damage either the battery
or the connecting object.
Leaving the battery in hot or cold places, such as in a closed car in
either 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 might not work temporarily, even if the
battery is fully charged. The performance of batteries is particularly limited
in temperatures below 0°C (32°F).
The following list provides guidelines that you can follow:
• When the operating time (talk time and standby time) is noticeably
shorter than normal, buy a new battery.
• Use the battery only for its intended purpose.
• Never use any charger or battery that is damaged and/or worn out.
• Batteries must be recycled or disposed of properly. Do not dispose of
batteries by putting them in fire!
• When you disconnect the power cord of any accessory, grasp and pull
the plug, not the cord.
• Important safety information
This section provides additional safety information. A brief overview of
safety can be found in “For your safety” on page 1.