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Fig.
113
"1
.'
",
.
".~
"
..
top Up with distilled
water.
This
must be done
when battery is cold and it has
not
been in
use for 5-6 hours. Correct level is attained when
electrolyte tops the plate separators
by
about
5
mm.
(3/16").
Bear
'
in mind that distilled water
container,
funnel, tubes,
spouts,
etc
.
must be in glass or
plastic
.
In any case they must be perfectly
clean. Make sure that distilled water does not
get in touch with any metal
container.
00
CHARGE CHECK
To find out charge condition of a battery it is
necessary to measure the density of
the
elec-
trolyte. Never use a fork type voltmeter
because
th is instrument wou ld cause a high
discharge
spark which, besides damaging
the
tested cell
would also involve a remarkable energy absorp-
tion
.
Charge condition
is
checked
by
means of a
hydrometer (see Fig. 113( at a room tempera-
ture of about
25°
C (7r
Fl
.
Density can be read at floating point of hydro-
meter,
keeping the instrument
perfectly
vertical
and checking that hydrometer can float freely
on electrolyte
.
After reading
,
pour
electrolyte
back in the same cell from which it had been
sucked
.
Density
sp.
gr.
1.28
1.25
1.22
1.19
1.16
'
.11
Battery charge in
%
100~/o
-
Normal service
75%
-
Service in tropical cond itions
5ri'lo
2SO/D
Nearly
discharged
(no
rmal service)
Nearly discharged (t
ro
pical
con dit
ions)
When battery is nearly discharged (that is to
say when density is 1.16 for normal service and
, .11 for tropical
conditions)
it will be necessary
to
charge same with an intensity of 4A.
If
the
machine is kept out of use for a long
time,
the battery should be given a charge every 30-
40
days,
otherwise it would quickly
deteriorate.
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