------ELECTRI~AL
EQUIPMENT
N
INITIAL FILLING
AND
CHARGING
Usually
the
battery
will have been filled and
initially charged. If, however, It should be found
necessary
to
prepare
a
new
battery, supplied dry,
proceed as follows
:-
be
interrupted
and
the
battery
temperatu
re allowed
to
fall at least
10"
F.
(5-5
0
C.)
before charging is
resumed.
At
the
end of
the
first Charge. l.e. when specific
gravity and voltage measurements remain substantially
constant, carefully check th e speelfie gravity in each
cell to
ensure
that
it lies within
the
limits specified.
If any cell requires adjustment, some
electrolyte
must
be Siphoned off, and replaced with
either
acid of
the
strength
used for
the
original
fiJi
ing in
or
distilled
water,
according
to
whether
the
specific gravlty is
too
low
or
too
high respectlvely. After such adjustment
the
gassing charge should be continued for
one
or
two
hours
to
ensure
adequate
mixing of
the
electrolyte.
Re-check. if necessary. repeating
the
procedure
until
the
desired result is obtained. Finally adJust
electro-
lyte to
correct
level.
Fig. N.2.
The early type
lucas
battery
partly sectioned to
show
the
arrangement
0'
the
plates and separators. Later
models
are
fitted with II
correct
acid level device and
ru
bber
vent
plugs.
(c)
Duration
and rate ofinitial charge
Charge at a
constant
current
of 3·5 amps. until
the
voltage and
temperature-corrected
specific gravity
readings
show
no increase
over
five successive hourly
readings. This period is
dependent
upon
the
length
of
time
the
battery
has been
stored
since manufacture.
and will be from forty
to
eighty hours.
but
usually
not
more
than
sixty.
Throughout
the
charge
the
acid must be
kept
level
with
the
tops
of
the
separators
in each cell by
the
addition of acid solution of
the
same specific gravlty
as
the
original filllng-in acid.
If,
during
charge.
the
temperature
of
the
acid In
any cell of
the
battery
reaches
the
maximum perrnts-
sible
temperature
of 120
0
F.
(""'9"
C.),
the
charge must
Add I part by
volume
of
To
obCaln
SpeCific
Gravity
1·835S.G. acid to distilled
(corrected
to 60°
F.
(16°
C.»)
waCer
by
volume
as
below
1·350
[·8 parts
1·320 2·2 "
1·300 2·5 ..
Heat is
produced
by
the
mixture
of acid and
water,
and it should
therefore
be allowed
to
cool before
pouring It into
the
battery.
otherwise
the
plates,
separators
and moulded
container
may become
damaged.
(b)
Filling
In and
soakIng
The
temperature
of
the
fllllng-In acid,
battery
and
charging
room
should be above
3r
F. (0" C.).
Carefully break
the
seals in
the
filling holes and
half-fill each cell In
the
battery
with dilute sulphuric
acid solution of
the
appropriate
specific graVity
(according
to
temperature)
(see table In (0) above).
The
quantity of
electrolyte
required
to
half-fill a
two-volt
cell
is!
plnt (,28
litre).
Allow
to
stand for
at least siX hours.
then
complete
the
filling of
the
cells by
the
addition of
more
diluted acid of
the
same
specific graVity as before unti I
the
level reaches
the
bottom
of
the
filling holes, and allow
the
battery
to
stand for at least
another
two
hours before com-
mencing
the
first charge.
(0)
PreporotJon
of
electrolyte
The specific gravity of
the
electrolyte
necessary
to
fill
the
new battery, and
the
specific gravity at
the
end of
the
charge.
are
as follow
:-
S.G.
of
S.G.
at
End
FilUng
Acid
of
Charge
Climate
(corrected
Co
60°
F.
(16°
C.»
Ordinarily
below 80
0
F.
(270
C.) ... 1·350 1·280-1·300
Between 80°_100" F. 1·320
1·150-1·270
Over
100" F. (38
0
C.) 1·300 1·220-1·2,,",
The
electrolyte
is
prepared
by mixing distilled
water
and
concentrated
sulphuric acid 1·835 S.G.
The
mixing must be
carried
out
in a
lead-Hued
tank
or
a suitable glass
or
earthenware
vessel. Steel
or
iron containers must
not
be used. The acid must be
added slowly
to
the
water.
while
the
mixture
is
stirred
with a glass rod.
Never
add
the
water
to
the
acid,
as
the
resulting chemical reaction may have dangerous
consequences.
To produce electrolyte of
the
correcC specific
gravity. use
the
follOWing
proportions
of acid and
distilled
water
:-
M.G. Midget
(Series"
TO
").
Issue 3 (E) 793045--1/5]
N.]
Wishvilles Classic
Automobile Library
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