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Kawasaki Z250 1981 Service Manual Page 163

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has entered the
battery from imperfect sealing.
There·
fore, it is best
to
give
the
battery an
initial
charge
before
using
it
in
order
to ensure
long
battery
life.
J
WARNING
I
Becaus: the battery gives off an explosive
',·----•-gas mixture of hydrogen and oxygen,
keep any sparks or open flame away from the battery
during
charging.
•Pour
a 1.260 (specific
gravity at 20°C or 68°
F)
su lphu-
ric
acid
solu tion
into each
cell
of
the
battery up
to
the
upper level
line.
•Let
the battery stand
for
30 minutes, adding
more
acid
if the
level
drops during
th
is time.
NOTES
: l
. If
the tempera tu
re
of
the solution
is
over
30°C
(85°
F},
cool
the
so1L1tion
before
pou
ring
it
into
the
battery.
2. After
pouri
ng the acid into the
battery,
start
charging
the
battery within 12
hours.
•Leaving the caps
off
the
cells, connect the battery to
,t
charger,
set the charging rate
at
1/10
the battery
capacity, and charge it
for
10 hours. For
example,
if
the battery
is
rated
at lOAH,
the charging
rate
would
be 1.0 ampere.
If
a
constant
voltage
charger
is used,
the voltage
must
be
adjusted
'periodicall
y
to
keep
the
current at
a constant
value.
(§~IT@
!~se:~~o~:~~~~t(~r;s
0
%
;~;in:
1
~~~~
1
i~~~
reduce
the
charging rate
to
bring down the temperature,
and increase the charging t ime proportionately.
•After ch
arging, check
the
electrolyte
level
in each
cell.
If
the
level
has
dropped,
add distilled
water
to bring
it
back up
to the
upper
level line.
•Cheek the
resu
Its
of
charging by
measuring
the
5peci fie
gravity
of
each
cell
and
by
measuring
battery
voltage.
Battery
voltage of
a 12
volt battery d irectly after
the
completion
of
charging should be 15 to 16 volts.
Ordinary charge
I
WARN I NG
I
Becaus_e the battery gives off an explosive
...,.
- - - - • - gas mixture of hydrogen and oxygen,
keep any sparks or open flame away from the battery
during charging.
•Clean off the
battery
using
a solution of baking
soda
and water.
Make
especially
sure that
the
terminals
are
clean.
• If the
electrolyte
level is
low
in any
cell
,
fill to
over
the
lower level
line bu
t
not
up
to
the upper
level
line
since the
level
rises
durin
g
charging.
Figure the charg-
ing
rate
to
be
between
1
/l
O
and
3/10
of
battery
capacity.
For examp
le,
the maximum charging
rate
For a
lOAH
battery
would
be 3i10
x
l
O
which
equals
3.0
amperes.
Table
K1
Battery Troubleshooting Guide
Good
Battery
Plates
(+)
chocolate color
-
(
} gray
Sediment
none, or
smal
l
amount
Voltage
above
12
volts
Electroly
te Level
above
plates
Specific Gravity
above
1.200 in all
cells; no
two
cell
s more than 0.020 different
MAINTENANCE-
ELECTRICAL 157
•Measure the specific
gravity of
the
electrolyte,
and
use
the
graph,
Fig. K2
to
determ ine the percentage of dis-
charge.
Multiply
the
capacity
of
the battery
by
the
percentage of discharge
to
find
the amoun
t
of discharge
in
ampere-hours. Use
this
figure
in the form ula
below
to compute charging time.
Amou
nt of
discharge (AH)
Charging (hou rs):=
x
1.2-1.5
charging current
(A)
•Remove
the
caps from
all
the
cel
ls, and begin
charging
the battery
at
the rate
just
calculated.
If
a
constant
voltage
charger
is used, the
voltage
will
have to be
ad justed periodical
ly
to maintain
charging
current
at a constant
value.
[§ill
!:~~:
t~~J>ra~~;e5~; t~~~~~:ro!~:~;ii~::
reduce the charging rate to bring down the temperature,
and increase charging time proportionately.
•After
charging,
check the
electrolyte
level in
each
cel l.
If
the
level
has
dropped,
add
distil led
water
to
bring
it
back
up to the
upper
level
line.
•Check
charging
resu lts by
measuring the specific
gravity of each
cell
and by measuring
battery vol
tage.
Battery
voltage of a
12
volt
battery
directly after
the
comp letion
of charging shou
ld
be 15 to 16 volts.
If the
voltage is
lower
than
this, the
battery
is
no
t
completely
charged
or
can
no longer
take
a
ful
l
charge.
Test charging
When
the
battery is
suspected or
being defective, fi
rst
inspect the poin
ts
noted
in the
Table
below.
The
battery
can
be
restored by
charging
it
with
the
ordinary
charge.
If
it
wil
l
take a charge so
that the voltage
and
specific gravity
come up to normal,
it
may be
considered
good
except
in the fo llowing case:
*
If
the
voltage suddenly
jumps
to
over
13
volts just
after the start
of
charging, the plates
are
probably su
phated.
A good battery
will
rise
to
12 volts
immed
iately
and
then
gradually go up
to
12 .
.5
-
13
volts
in
about
30
to
60 minutes
,1fter charging is started.
*
If
one
cell
produces
no gas
bubbles, or has
a
very
low specific grc1vi
ty, it
is probably shorted.
*
If
there
does
not
appear
to
be
enough sediment to
short the
plates,
but one
cell has
a
low
specif
ic gravity
after
the battery
is
fu
ll
y
charged, the
trouble
may be
just
that
there is insuffic ient acid in that cel
l. In
this
instance
on ly,
sulphuric acid
solution
may be added to
corre.ct
the
specific
gravity.
Suspect Battery
Action
white
(su
lphated};
+
plates
Replace
broken
or corroded
Sed iment up
to
plates, causing
short
Replace
below 12 volts
Test
charge
below top
of
plates
Fill and test
charge
below
1.100,
or
di
fferen ce
of
more
Test
charge
than
0.020
between
two
cells

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