Nokia 6310i - Manual (Page 118)

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Reference information
When the battery is running out of power and your phone only has a few
minutes of talk time remaining, a warning tone sounds and the
Battery
low message appears briefly. When no more talk time is left, a warning
tone is sounded and the phone switches off.
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 the end 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
such objects 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 Li-Ion 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.