tT
Determining
!he Degree of Discharge from Specific Gravity of
Electroiy!e
fu
lly
l'horged
baltery
l.2
(10
1
.270
Speci
fi
c gr
aYity
of el
ectrolyte
al
+
1
5~C
25%
discharged
1.
26
0
1
.2-
10
50%
discl1arged
1
.2
30
1.
2
10
In
c<~se
measurements are made at
temperatures
other than soe-
cified , the densimeter rea dings should be
co
rre
ci.ecl
(by a
ddi
ng'
or
subtracting)
in
accordance with t
he
Table gi\'en below:
I
+4j
i
+30
+ I,)
-
13
30
Cor
re
ction
for
clens
i- '
+0.
02
1 +
0.01
111
L'kr
reading
1
o I - o.
o1
/ -
o.o2
j-
o.o3
-
o.o4
Fluctuations
in
the speci
fic
gravity
of
the
batt
ery ce
ll
s
mu
st not
be
gr
eater than
0.0
l.
In order to m
easure
the sp
ec
ifi
c gravity of elect
ro
lyte, proceed
as
follo·ws:
unscrew the plug from the cover
of
a
batter
y cell;
draw in some e
le
ctrolyte with lhe densimeter sy
ring
e;
by
mea ns of a thermomete
r,
measure the tempe
ratur
e of the elec-
trolyte in the cell;
determine the speci
fi
c gra vity of electrolyte on the basis of densi-
meter rea
eli
n
gs
corrected for temper a ture.
The level
of
electrolyte over
th
e plates shou ld be ·
measured
by
means
of
a gl ass tubule
in
serted into the filling hole
of
eac
h
ce
ll
,
for w
hi
ch purpose proceed as
fo
llows:
unscrew the p
lu
g
fr
om the battery cell cover;
lower the tubule until it is aga
in
st the protective shield;
close
lhe upper
en
d with the finger;
take out the tubule.
The level
of
the electrolyte must be
10
to 12 mm above the pro-
tecli\·e
shield.
The storage
batte
ry capacity
is
determin
ed
a
ft
er
fu
.
ll
charging
followed by
10
hour
rate
of
discharge, the discharge cu
rr
e
nt
be
i
ng
eq
ua
l to
1.2
A for
31\'lT-
12
a
nd
0.6
A
for
3M
T-6.
In
this
case the
f
in
al
vo
lt
age
must be within 1.7 V for each
of
the ce
ll
s.
If
the
vo
ltage is below the spec
ifi
ed
fi
gur
e,
this
means
that the
battery is faulty.
!04
To
fu
lly
charge
the bali.ery being checked, proceed
as
fol
lows:
add distilled
water
into
th
e
ce
ll
s
up
to the required l
eve
l;
cha rge the
battery
with
1.5
A
current
in
the case of 3MT-12
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