• No charging is necessary when the open-cir-
c
ui
t voltage eq
ua
ls
or
exceeds 12.8 V.
b. Check the charge of the battery, as shown in
the charts and t
he
fo
ll
owing exampl
e.
Example
Open-circuit voltage
= 12.0 V
Charging time
= 6.5 hou
rs
Ch
a
rg
e of the battery =
20-30
o/
o
A
13.0
12
.5
12
.0 - - - - - - - - -
11.5
D
5 6.5 10
A. Open-circuit voltage (V)
B. Chargi
ng
time (hours)
B
C. Rel
at
ionship between the open-circuit volt·
age and the chargi
ng
time at 20 °C (68 °F)
0. These values vary with the temperature, the
condition of the battery plates, and the elec-
trolyte
le
vel.
A
14
13
12
II
10
-
I
100
75
I
I
'
I
•-.....
I
I
I
'
I
I
'
I
I
I
I
I
•
I
50 30
2520
0
A. Open-circuit voltage (V)
c
B. Chargi
ng
condition
of
the battery (
o/o
)
C. Amb
ie
nt
te
mp
er
at
ure 20 •c (68 °
F)
B
••••••••••••••••••••••••••••••••
5. Charge:
• Battery
(refer to the appropriate cha
rgi
ng method)
EWAl$300
AwARNING
Do
not
quick
charge a battery.
NOTICE
~~~~~~~~~~~~~~
• Do
not
use
a
high
-rate battery
charger
since
it
forces
a
high
-amperage
current
into
the battery
quickly
and
can cause bat-
ELECTRICAL COMPONENTS
tery
overheating
and
battery plate damage.
• If
it
is
impossible
to
regulate
the
charging
current
on
the battery charger,
be
careful
not
to overcharge the battery.
•When
charging
a battery,
be
sure
to
remove
it
from
the vehicle. (If charging
has
to
be
done
with
the battery
mounted
on the vehi·
cle,
disconnect
the
negative
battery
lead
from
the
battery
terminal.)
•
To
reduce the chance
of
sparks,
do
not
plug
in
the battery
charger
until
the battery
charger
leads are connected
to
the battery.
• Before removing
the
battery
charger
lead
clips
from the battery terminals,
be
sure
to
turn
off
the
battery
charger
.
• Make
sure
the battery
charger
lead
clips
are
In
full
contact
with
the battery terminal
and
that
they
are
not
shorted
. A
corroded
bat
-
tery
charger
lead
clip
may
generate
heat
in
the
contact
area
and
a weak
clip
spring
may
cause
sparks
.
• If the
battery
becomes
hot
to
the
touch
at
any
time
during
the
charging
process
,
dis-
connect
the
battery
charger
and
let
the
bat-
tery
cool
before
reconnecting it.
Hot
batteries can explode!
•
As
shown
in
the
following
illustration
, the
open-circuit
voltage
of
a VRLA (Valve Reg-
ulated Lead Acid) battery stabilizes
about
30
min
u
tes
after
charging
has
been com-
pleted. Therefore,
wait
30
minutes
after
charging
is
completed before measu
ring
the
open-
circuit
voltage.
A C
"
~
-
·
D
'
18
17
16
15
14
13
12
II
10
o 10 20
~
40
~
ro
B
4E
A. Open-circuit
vo
ltage (V)
B. Time (minutes)
C. Charging
O. Ambi
en
t t
em
perature 20 •c (68 °F)
E. Check the open-circuit
vo
ltage.
TTYTTTYYTTTYTTTYYTTTYTTTYTTTYYTT
Charging
method
using
a variable-
curr
e
nt
(voltage)
charger
a. Measure the open-circuit voltage p
ri
or
to
8-95
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