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5.
4
POWER CIRCUIT
123
Battery Case
The 450
like
other models,
uses
a transparent
styrol
battery
case
which permits the electro lyte
and
the plate
conditions
to
be
visible.
After
assemblying the
plate elements
into the case,
the cover
is sealed
to the case
with
synthetic
resin
cement and
upon
connect
ing
the cell
terminals
with
pole
connectors, synthetic
resin,
pitch are
used
to
set
the
plate elements
in place to
prevent their
lo-
osening from vibration or develop
leaking of the
electr
olyte.
(Fig. 5. 40)
When a
load
such as the lights is
connected
across the
battery terminals, the
battery will
start
and
continue to discharge.
The active lead
peroxide of
the anode and
the
sponge
lead
of
the cathode
will generate sulfation
causing
the
specific gravity
of
the electrolyte
to
gradually drop with
a
resultant decrease
in the
bat-
tery terminal voltage.
Since
the
specific gravity
is approximately proportional
to
the
discharge con-
dition
of
the
battery,
the measure of this vaule
will
provide the relation
duscharge state of
the
battery.
The
specific gra
vity of the battery
elec-
trolyte when fully
charged is 1.
26
and
when
com-
pletely
discharged is
1.
10
(Fig.
5.
41
1)
The sulfuric
ac
id
used
for the electrolyte
will
vary with
the
temperature,
but normally
sulfuric
acid
having a
specific gravity of 1. 260 at 20°C (68°Fl
is used
with
slight
difference with
types
of battery.
When an electrical
current
is
made
to
flow
into
the battery in the
·
reverse direction
of
descharging,
the battery
becomes
charged and the lead
sulfate
both the anode and cathode
plates
resent lock to
the
original
lead peroxide and sponge lead
respec-
tively.
The specific
gravity of
the electrolyte
in-
creases
with
a resultant
rise in the terminal
voltage.
Capacity and Discharge Ratio (Charging ratio
).
The
capacity
of
the
battery
is determined by
discharging a fully charged
battery at
a constant
discharge
rate to a specified terminal voltage
value.
(average of 1. 7
5
volt
per
celll.
It
is expressed
by the discharge current and the
time
duration as AH (ampere-hourl.
However, the
capacity of the battery
will
vary with discharge
rate, temperature and
specific
gravity,
therefore,
the condition for testing automobile and motorcycle
batteries are specified.
JIS Uapan Industrial Standard) TEST CONDITION.
Electrolyte
specific
gravity :
1.
260
±
0. 005 at
20°C (68°FI
fig.
5. 40
Battery components
(D
Cathode pla
te
@
G
lass mat
®
Gride plate
..,
uo
'
>-
0
1.2s
I
~
"'
L
®
Separator
©
Anode
plate
®
Glass mat
0
1.22,
-f
[
Half
crnrged
!
1.18
[
-- ----
-
---- -
I
·i
1. 14
__
_____
___
j
_______
Discharged
en
1
:
I
Cooipletely
I 10
L-
'
'
'
'
d
"
ha
d
.
JOO%
80
60
40
20
0
!SC
rge
Batt
e ry
electric capacity
Fig
.
5
.
41
Speci fic grav ity and electric
capac
ity
re
lati on
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