Nokia 638 Cellular Phone
(170-1211) Batteries Faxback Doc. # 45242

Battery Information

Battery Options

The following battery options are available for your phone. Consult your
local dealer for more information.

The battery charging times depend on the remaining battery charge and the
type of battery and charger used.

Charging Times:

ACH-8U LCH-6

Slim Battery BBT-6L 2 h 30 min. 45 min.
470 mAh NiMH

Extended Battery 4 h 30 min. 1 h 30 min.
BBT-65 950 mAh NiCd

Ultra Extended Battery 9 h 3 h
1700 mAh NiMH

NOTE: The above charging times are approximate.

Talk and Standby Times:

TALK STANDBY

Slim Battery BBT-6L 1 h 13 h
470 mAh NiMH

Extended Battery 2 h 26 h
BBT-6S 950 mAh NiCd

Ultra Extended Battery 3 h 20 min. 47 h
1700 mAh NiMH

Installing and Charging a Battery

For installing, removing and charging the battery, see Getting Started
on Faxback Doc. # 45238.

Discharging a Battery

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 auto-
matically turns itself off after the battery has been completely discharged. Alternatively, 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.

Recharging a battery

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 repeated
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 Faxback Doc. # 45240.)

Recharge the battery as described in Charging a Battery on Faxback Doc.
# 45238.

Using Batteries

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 hundreds 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.

Never use a charger or battery which is damaged or worn out.

Use the battery for its intended purpose only.

Use only batteries and chargers approved by the phone manufacturer. When
a charger is not in use disconnect it from the power source. Do not leave
the battery connected to a charger for longer than a week, since over-
charging may shorten its life. If left unused a fully charged battery
will discharge itself in about a week at room temperature.

Leaving the battery in hot or cold places, such as in a closed car in
summer or winter conditions, will reduce the capacity and lifetime of the
battery. Always try to keep the battery between 59 degrees F (15 degrees
C) and 77 degrees F (25 degrees C). A phone with a hot or cold battery
may temporarily not work (or charge), even when the battery is fully
charged. The battery may require cooling or warning first. The perform-
ance of NiMH batteries is particularly limited in temperatures below 14
degrees F (-10 degrees C).

Do not short circuit the battery. Accidental short circuiting can occur
when a metallic object (coin, clip or pen) causes direct connection of
the + and - terminals of the battery (metal strips on the back of the
battery) when you carry a spare battery in your pocket or purse. Short
circuiting the terminals may damage the battery or the connecting object.

When the battery is not in use, store it uncharged in a cool and dark
place.

Dispose of used batteries in accordance with local regulations. Recycle!

Do not dispose of batteries in a fire!

Nickel Cadmium and Nickel Metal Hydride batteries must be recycled or
disposed of properly. Must not be disposed of in municipal waste.

(LB/EB 11/5/97)