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BATTERY
CHARGING
1.
AVAILABLE CHARGERS
Available chargers
include
a single-unit desk
top
charger, a single-unit Porta-Pocket charger, and
multi-
unit
chargers
that may be mounted
on
a wall
or
a
bench.
The
multi-unit
chargers
will
charge
up to
six
nickel-cadmium batteries at once.
The
single-unit desktop and
multi-unit
chargers are
rapid-charge models, while the porta-pocket is
a
slow-
charge
model.
The slow-charge
model
will
charge any
of the batteries, with or without the radio attached,
in
16 hours.
The
rapid-charge models
will
charge any
of
the batteries
in
approximately one
hour.
Refer
to
the
ACCESSORIES
page
at the beginning
of this manual for
a
list of
the available battery charg-
ers and
their applications.
For
further information,
con-
tact your
Motorola
sales
representative.
2.
BATTERY
CONSTRUCTION (See
Figure
1)
TO
RADIO
S-
+
S+
\
T
+f
TO CHARGER
MAEPF-19700-0
Figure
1.
Typical Battery Construction,
Rear
View
The
SABER
rapid-charge battery has four charger
contacts,
two of which
receive the charging
current.
A
third
contact connects the
internal
capacity resistor
(RC)
to the charger, automatically setting the
charging
current output to match the
capacity
of the battery.
-
The
fourth
contact connects an
internal thermistor to
the charger.
The
thermistor
senses
battery tempera-
ture and automatically controls the
charger
output to
permit maximum
charger
output without
overheating
the battery.
......_4...MAINTENANCE...._...
All rapid-charge batteries contain an internal cur-
rent-limiting
device
(thermal
fuse)
for protection.
A
diode
in
the battery prevents
damage
from an
acci-
dental short between the charging contacts.
CAUTION
»Sustained-shorts across the
radio contacts °(+<-*):-axces=
a
rrent, or
excessive
heat will destroy the internal
sive cu
wh ch. s notre
thermal
fuses
3.
BATTERY CHARACTERISTICS
Each
nickel-cadmium battery has six cells connect-
ed
in
series
to
provide a nominal 7.5
Vdc
output,
which remains approximately constant under load
until
the battery
approaches
a
discharged
condition.
At
this
time,
a marked decrease
in
voltage occurs
and the
discharge condition (1.0
volt per
cell)
is reached
abruptly.
A
general characteristic
of all rechargeable batter-
ies
in
storage
is
self-discharge.
If
the battery is to be
used after an unknown
period of
storage,
it
is recom-
mended that
it
be
charged
at the
full
charging
rate
using an approved battery charger.
The
battery
cells
will
never
require additional
elec-
trolyte.
The
only maintenance required is recharging
the battery and keeping its
contacts clean. Use only a
Motorola approved charger.
The use
of other
charg-
ers, unless approved,
will
void the battery warranty
and may result
in
permanent damage
to
the battery.
THERMOSTAT
5.
STORAGE
The
battery may be stored at
room
temperature
in
any state
of
charge
without
damage.
As
previously
stated, however,
the battery is
subject
to
self-
discharge
and should be recharged after extended
storage.
6.
DETERMINING
BATTERY CAPACITY
Battery capacity is determined by measuring the
time that
a
fully-charged battery requires to discharge
to
six volts
through
a specified
load,
as
described
in
the following procedure:
NOTE
This
procedure requires using a 20-ohm, 1%,
10-watt load resistor to discharge medium-capacity
batteries, and an 11-ohm, 1%, 15-watt load resistor
to
discharge high- capacity batteries.
3
BATTERY
CHARGING
1.
AVAILABLE CHARGERS
Available chargers
include
a single-unit desk
top
charger, a single-unit Porta-Pocket charger, and
multi-
unit
chargers
that may be mounted
on
a wall
or
a
bench.
The
multi-unit
chargers
will
charge
up to
six
nickel-cadmium batteries at once.
The
single-unit desktop and
multi-unit
chargers are
rapid-charge models, while the porta-pocket is
a
slow-
charge
model.
The slow-charge
model
will
charge any
of the batteries, with or without the radio attached,
in
16 hours.
The
rapid-charge models
will
charge any
of
the batteries
in
approximately one
hour.
Refer
to
the
ACCESSORIES
page
at the beginning
of this manual for
a
list of
the available battery charg-
ers and
their applications.
For
further information,
con-
tact your
Motorola
sales
representative.
2.
BATTERY
CONSTRUCTION (See
Figure
1)
TO
RADIO
S-
+
S+
\
T
+f
TO CHARGER
MAEPF-19700-0
Figure
1.
Typical Battery Construction,
Rear
View
The
SABER
rapid-charge battery has four charger
contacts,
two of which
receive the charging
current.
A
third
contact connects the
internal
capacity resistor
(RC)
to the charger, automatically setting the
charging
current output to match the
capacity
of the battery.
-
The
fourth
contact connects an
internal thermistor to
the charger.
The
thermistor
senses
battery tempera-
ture and automatically controls the
charger
output to
permit maximum
charger
output without
overheating
the battery.
......_4...MAINTENANCE...._...
All rapid-charge batteries contain an internal cur-
rent-limiting
device
(thermal
fuse)
for protection.
A
diode
in
the battery prevents
damage
from an
acci-
dental short between the charging contacts.
CAUTION
»Sustained-shorts across the
radio contacts °(+<-*):-axces=
a
rrent, or
excessive
heat will destroy the internal
sive cu
wh ch. s notre
thermal
fuses
3.
BATTERY CHARACTERISTICS
Each
nickel-cadmium battery has six cells connect-
ed
in
series
to
provide a nominal 7.5
Vdc
output,
which remains approximately constant under load
until
the battery
approaches
a
discharged
condition.
At
this
time,
a marked decrease
in
voltage occurs
and the
discharge condition (1.0
volt per
cell)
is reached
abruptly.
A
general characteristic
of all rechargeable batter-
ies
in
storage
is
self-discharge.
If
the battery is to be
used after an unknown
period of
storage,
it
is recom-
mended that
it
be
charged
at the
full
charging
rate
using an approved battery charger.
The
battery
cells
will
never
require additional
elec-
trolyte.
The
only maintenance required is recharging
the battery and keeping its
contacts clean. Use only a
Motorola approved charger.
The use
of other
charg-
ers, unless approved,
will
void the battery warranty
and may result
in
permanent damage
to
the battery.
THERMOSTAT
5.
STORAGE
The
battery may be stored at
room
temperature
in
any state
of
charge
without
damage.
As
previously
stated, however,
the battery is
subject
to
self-
discharge
and should be recharged after extended
storage.
6.
DETERMINING
BATTERY CAPACITY
Battery capacity is determined by measuring the
time that
a
fully-charged battery requires to discharge
to
six volts
through
a specified
load,
as
described
in
the following procedure:
NOTE
This
procedure requires using a 20-ohm, 1%,
10-watt load resistor to discharge medium-capacity
batteries, and an 11-ohm, 1%, 15-watt load resistor
to
discharge high- capacity batteries.
3
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