Haier C5100, Руководство пользователя

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If you use the phone near the network's base station, it uses less power. Talk
and standby time are greatly affected by the signal strength on the cellular
network and the parameters set by the network operator.
Battery charging time depends on the remaining battery charge, the type of
battery, and the charger used. The battery can be charged and discharged
hundreds of times, but it will gradually wear out. When the operation time is
noticeably shorter than normal, it is time to buy a new battery.
If left unused, a fully charged battery will discharge itself over time.
Extreme temperatures will affect the charging capacity of your battery: it may
require cooling or warming first.
Do not leave the battery in hot or cold places because the capacity and
lifetime of the battery will be reduced. Try to keep the battery at room
temperature. A phone with a hot or cold battery may not work temporarily, even
when the battery is fully charged. Li-ion batteries are particularly affected by
temperatures below 0°C (32°F).
Use only approved batteries and chargers. Disconnect the charger from the
power source when it is not in use. Do not leave the battery connected to a
charger for more than a week, since overcharging may shorten its life.