Raytheon Beech Baron E55 - Page 607

Ray~heon
Aircraft
Company
BARON
55
AND
58
SHOP MANUAL
CAUTION:
When
a
battery
is
connected
to
a
constant
potential
charging
source,
the
initial
high
charging
current
will
damage
any
0-25
or
0-50
ampere-scale
arnmeter
connected in
series
with
the
battery
c.
When
a
battery
is
connected to
a
constant
potential charging
source,
the
initial
high
charging
current
will
damage
any
0-25
or
0-50
ampere-scale
ammeter
connected
in
series
with
the
battery.
d.
Should
a
battery
be
severly
discharged,
charging
by
the
constant
potential
method
may
produce
a
slight
imbalance
in
cell
capacity.
The imbalance
can
be
detected
by
a
periodic
check of
the
cell
terminal
voltages
with
a
precision
voltmeter
after
the
charging
current
levels
off
to
a
few
amperes
while
the
battery
is
charging.
Should
some
cells
differ
from
others
by
more
than
0.05
volts,
connect
the
battery
to
a
constant
current
source
and
charge
for
14
hours
at
a
rate
of
2.5
amperes.
BA
TTERY
STAND-B
Y
CHARGING
Since
the
self-discharge
rate
of
a
nickel-cadmium
battery
is
approximately
1.2
percent
per
day
at
normal
temperatures,
standby charging
is
required
to
maintain
a
battery
at
its
full
rated
capacity.
For
standby
charging
in
the
temperature
range
of
60"
to
90"F,
use a
current
equal
to
0.003
ampere per
each
ampere
hour
of
rated
capacity.
Batteries
on
stand-by
charge
must
regularly
checked
to
ensure
adequate
electrolyte
level.
CAPACITY
RECONDITIONING
The
capacity
of
a
nickel-cadmium
battery
does
not
decrease
appreciably
with
age.
However,
there
can
be
a
temporary
loss
of
capacity
under
certain
duty cycles.
A
temporary
loss
of
capacity
is
nomnally
an
indication
of
imbalance
between
cells.
Imbalance
can
be
caused
by
differences
in
temperature,
charge
efficiency,
self-discharge
rate,
etc.
The
purpose
of
reconditionlng
is
to restore
a
battery
to
its
full
capability
and
to
prevent premature
damage
and
failure.
Effective
reconditioning
requires
specific procedures
for
certain
periods
of
time. No
step
in the
procedure
can
be
eliminated
nor can
any
time
period
be
shortened and
still
yield
effective
battery
reconditioning.
FREQUENCY
OF
RECONDITIONING
Due
to
the variables
involved
in
usage,
it is
impossible
to
establish
a
time interval
for
reconditioning
that
will
cover
all batteries.
Until
service
experience
dictates
otherwise,
a
visual
and
electrolyte
check of
the
battery
should
be
made
after
the
first
50
hours
of
flight.
If
the condition
of
the
battery
is normal
and
the
level of
electrolyte
in the
battery
is
satisfactory,
schedule
the
initial
reconditioning
procedure
outlined below
at
100-hour
intervals
until
servicing
justifies
a
change.
I
NOTE: The
log
of
battery
services
performed
should
be
evaluated to determine
the
need
for
servicing,
the
battery
at
the
above
recommended
intervals
or
extending
the intervals.
Accurate
water
consumption
data
is
a
valid
barometer
to
use
for
adjustment
of
the
servicing
intervals.
RECONDITIONING
PROCEDURE
a.
Discharge
the
battery
at
a
current
equal
to
or
less than
the
one-hour
rate.
Short
out
each
cell
as
it
drops
below
0.5
volts.
The
cells
may
be
shorted
by
clips
or
by
wires
having
clips
on
each
end.
Allow
the shorts
to
remain
on
the
cells for
a
minimum
of
16
hours,
and
preferably
for
24
hours.
b. Remove
the
shorting
clips
and
charge
for
24
hours at
1.0
amperes.
After
approximately
5
minutes
of
charge,
measu
re
the
individual
cell
voltages.
If
any
cell
voltage
is
greater
than
1 .50
volts,
add distilled
water.
The
amount
of
water
required
is
approximately
I
cc
per
rated
ampere-hour
capacity,
for
example,
a
25
ampere-hour
cell
may
require
about
25
cc
of
water at
this time.
c.
After
approximately
10
minutes of
charge,
remeasure
the cell
voltages.
Replace
any
cell
that
measures
below
1.20 volts
or
above
1.55
volts.
E21
SECTION
13
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