Nokia 638 User Guide

A battery lasts longer and performs better if allowed
to discharge fully from time to time. 

You can do this by leaving your phone switched on
until the phone automatically turns itself off after
the battery has been completely discharged. Alter-
natively, you may use the battery discharge facility
of any approved accessory available for your phone.

Note: Do not attempt to discharge the battery by
any other means. 

When the battery charge is low and only a few
minutes of talk time remain, a warning tone will be
given and the message 

BATTERY LOW will be re-

peated at regular intervals on the display.

When the battery charge level is too low for the
phone to operate, the 

RECHARGE BATTERY

message will be displayed and a warning tone will
be given before the phone automatically switches
itself off (after about 10 seconds). 

Note: If SILENT SERVICE has been selected,
only the display messages appear. (See Ringing
Volume on page 32.)

Recharge the battery as described in Charging a
Battery on page 8.

•

A new battery’s full performance is achieved only
after two or three complete charge and discharge
cycles.

•

To achieve full battery capacity, new batteries
must be charged with the phone off for at least
24 hours before initial use.

•

The battery can be charged and discharged hun-
dreds of times but it will eventually wear out. When
the operating time (talk-time and standby time) is
noticeably shorter, it is time to buy a new battery.

NHA-4NG Nokia 638_AU 
Authentication version
US English 9351137
Issue 3

Version: 0.7, Date: 11 (2) Dec.
1996
Status: ToL, JaK, JaG, SIR, JoF

42