Nokia 2135 - Manual (Page 52)

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7. Reference information
This section provides information about your phone
batteries, enhancements, chargers, safety guidelines and
technical information. Be aware that the information in
this section is subject to change as batteries, chargers,
and enhancements change.
■ Batteries and chargers
Your device is powered by a rechargeable battery. 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. The use of any other types may
invalidate any approval or warranty, and may be
dangerous.
If a replacement battery is being used for the first time or
if the battery has not been used for a prolonged period, it
may be necessary to connect the charger, then disconnect
and reconnect it to begin charging the battery.