Care & Maintenance
Section 4
Page 81
Page 81
A.
When To Charge Or Replace Batteries
2.4
The unit displays an estimate of battery charge:
voltage for alkaline batteries and percent of power
used for rechargeable batteries. The unit also displays
“
CHARGE BATTERIES
” to prompt you to recharge the
batteries (if rechargeable), or replace them with either
alkaline dry cells or a spare set of rechargeable batteries.
2.5
With the batteries removed, the unit can retain
stored telephone numbers up to three minutes.
After ten minutes without battery power, stored numbers
are lost. When you install a freshly-charged set of
nickel-cadmium batteries, press the
AUTO CAL
key and
select the battery identification option. Answer the
questions correctly to make the display indicate full charge.
B.
Internal Battery Charging
2.6
To use the internal battery charger, follow the
instructions on the display to attach the leads to a
12-volt source (e.g., a Dynatel 1678 Battery Charger Kit
for one unit, or 1658 for up to three units). Turn the unit
on and press the
AUTO CAL
key. Press the
(star key)
to select
CHARGE BATTERY
, then press the
(star
key) for normal charging or the
(pound key) for
overcharging. The unit turns off automatically when
charging is complete.
C.
External Battery Charging
2.7
If the battery charge gets too low to turn the unit
on, take off the battery cover and remove the
batteries. Recharge the cells with an external
(user-supplied) AC-powered battery charger. Charge the
cells at approximately 180 mA for no more than 18 hours.
Important:
Prolonged overcharging (maximum 18 hours) reduces
battery life.
