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BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS
8A - 7
BATTERY CHARGING TIME TABLE
ChorgRig Ampswgu
5 Amps
10 Amps
20 Amps
30 Amps
Open Circuit Voltage
Hours Charging at 21°C (70°F)
12.25 to 12.39
6 Hrs
3 Hrs.
1.5 Hrs.
1 Hr.
12.00 to 12.24
8 Hrs.
4 Hrs.
2 Hrs.
1.5 Hrs.
11.95 to 12.09
12 Hrs.
6 Hrs.
3 Hrs.
2 Hrs.
10.00 to 11.95
14 Hrs.
4 Hrs.
3.5 Hrs.
2.5 Hrs.
10.00 to 0
See Charging Completely Discharged Battery
J908A-6
spect battery hold downs, t r a y , t e r m i n a l s , posts, a n d
top before completing service, see Group 8 B , Battery/
Starter Service.
CHARGING
TIME
REQUIRED
The t i m e required t o charge a b a t t e r y w i l l v a r y de-
pending upon
v
the following factors:
(1) Size of
B a t t e r y — A completely
discharged
large heavy-duty b a t t e r y requires more t h a n twice
t h e recharging t i m e as a completely discharged s m a l l
capacity battery.
WARNING:
NEVER
EXCEED 20 AMPS
WHEN
CHARGING A COLD
(-1°C/30°F) BATTERY,
PER-
SONAL INJURY MAY RESULT.
(2) T e m p e r a t u r e — A longer t i m e w i l l be needed
to charge a battery a t -18°C (0°F) t h a n a t 27°C
(80°F). W h e n a fast charger is connected t o a cold
battery, c u r r e n t accepted b y battery w i l l be very l o w
a t first. Then, i n t i m e , t h e battery w i l l accept a
h i g h e r rate as battery w a r m s .
(3) C h a r g e r C a p a c i t y — A charger, w h i c h can sup-
p l y only 5 amperes, w i l l require a m u c h longer pe-
r i o d of charging t h a n a charger t h a t c a n supply 30
amperes or more.
(4) State Of C h a r g e —
A completely
discharged
b a t t e r y requires more c h a r g i n g t i m e t h a n a p a r t i a l l y
charged battery. Electrolyte is nearly p u r e w a t e r i n a
completely discharged battery. A t f i r s t t h e c h a r g i n g
c u r r e n t amperage w i l l be low. A s acid i s forced from
t h e plates, inside t h e b a t t e r y , t h e c u r r e n t amperate
w i l l rise. Also, t h e specific g r a v i t y o f t h e electrolyte
w i l l rise, b r i n g i n g the green dot i n t o v i e w .
CHARGING
COMPLETELY
DISCHARGED
BATTERY
The following procedure should be used t o recharge
a completely discharged battery. Unless procedure is
properly followed, a good battery m a y be needlessly
replaced.
(1) Measure voltage a t battery posts w i t h a voltme-
ter, accurate to 1/10 v o l t (Fig. 13). I f below 10 volts,
t h e n charge current w i l l be low a n d i t could t a k e
some t i m e before i t accepts a current i n excess o f a
few milliamperes. Such l o w current m a y n o t be de-
tectable on amperemeters b u i l t i n t o m a n y chargers.
898A-12
Fig. 13 Voltmeter Accurate to 1/10 Volt Connected
(2) Connect charger leads. Some chargers feature
p o l a r i t y protection c i r c u i t r y w h i c h prevents operation
unless charger is connected t o b a t t e r y posts correctly.
A
completely
discharged
b a t t e r y
m a y n o t have
enough
voltage
to activate
t h i s
c i r c u i t r y ,
even
t h o u g h leads are connected properly, m a k i n g i t ap-
pear t h a t b a t t e r y w i l l n o t accept c h a r g i n g c u r r e n t .
Refer to instructions provided w i t h b a t t e r y charger
being used.
(3) B a t t e r y chargers vary i n the a m o u n t o f voltage
and current they provide. F o r t i m e r e q u i r e d f o r bat-
t e r y to accept measurable charger c u r r e n t a t various
voltages, refer t o Charge Rate chart. I f charge cur-
r e n t is s t i l l not measurable a t end o f c h a r g i n g times,
the battery should be replaced. I f charge c u r r e n t is
measurable d u r i n g charging t i m e , t h e b a t t e r y m a y
be good and charging should be completed i n t h e nor-
m a l manner.
CHARGE RATE
Voltage
Hours
16.0 volts or more
up to 4 hrs.
14.0 to 15.9 volts
up to 8 hrs.
13.9 volts or less
up to 16 hrs.
J908^7
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