THE
ELECTRICAL SYSTEM
BATTERY
Section
N.t
Charging (used battery)
(5) Charge
at
3·0 amps. until all cells
are
gassing freely
and
hydrometer
readings
of
each cell have
not
risen in
four
hours.
Do
not
allow the
temperature
of
the electrolyte
to
exceed
the
following
maximum:
For
climates below 27° C. (80°
F.)
30° C. (100° F.).
For
climates above 27° C. (80° F.) 49° C. (120° F.).
•
•
•
-.
Batteries filled
in
this
way
are
capable
of
giving a
starting discharge one hour after filling.
When
time
permits, however, a
short
freshening charge
at
the
normal
recharge
rate
(3,0 amps.) will ensure
that
the
battery
is fully charged.
During
the
charge
the
electrolyte
must
be
kept
level with
the
top
edge
of
the
separators
by
addition
of
distilled water.
Check
the
specific gravity
of
the
acid
at
the
end
of
the
charge;
if
1·260 acid was used
to
fill the battery,
the
specific gravity
should
now
be
between 1·270
and
1·290.
If
1·210 acid was used
the
specific gravity
should
now
be
between 1·210
and
1·230.
After
filling, a dry-charged
battery
needs
only
the
attention
normally
given
to
a lead-acid
battery.
Removing
(1) Disconnect
the
leads, slacken
the
four
mounting
bolts, remove
the
fan
belt
from
the
pulley,
take
out
the
two
upper
and
one
lower
mounting
bolts
and
lift off
the
dynamo.
MINI. Issue
2.
14091
DYNAMO
Section N.2
New, unfilled, uncharged battery
(7)
Half
fill each cell with electrolyte
prepared
as
in
item
(6)
above
and
allow
it
to
stand
for
six
hours,
fill
each cell
to
the
correct level
and
allow a
further
standing
period
of
two
hours.
(8)
Charge
at
2 amps. until five successive
hourly
hydrometer
checks show
no
increase
in
the
reading;
this will
take
from
48
to
80
hours,
depending
on
the
length
of
time
the
battery
has
been
stored
before
charging. This charge should
not
be broken by long
rest
periods.
(9)
If
the
temperature
of
any
cell rises above
the
maximum
given
in
(5),
the
charge
must
be inter-
rupted
until
the
temperature
has
fallen
at
least
5·5° C. (10°
F.)
below
that
figure.
(10)
Maintain
the
level
of
the
electrolyte
during
the
charge.
(11)
At
the
end
of
the
charge carefully check
the
specific
gravity
in
each cell
to
ensure
that,
when
corre~ted
to
16°
C. (60°
F.)
it
lies between
the
specified
If:'
s.
If
any
cell requires
adjustment
some
of
the
ele
te
must
be siphoned
off
and
replaced either b
tilled
water
or
by
acid
of
strength originally
for
filling in, depending
on
whether
the
speci c
gravity is
too
high
or
too
low.
Continue
the
charge
for
an
hour
or
so
to
ensure
adequate
mixing
of
the
electrolyte
and
again
check
the
specific gravity
readings.
If
necessary,
repeat
the
adjustment
pro-
cess until
the
desired reading is
obtained
in
each
cell.
(12) Finally, allow
the
battery
to
cool,
and
siphon
off
any surplus electrolyte.
3·2 volumes
of
water
4·3 volumes
of
water
1·210
1·260
Dry-charged batteries
Dry-charged batteries are supplied
without
electrolyte
but
with
the
plates
in
a charged condition.
No
initial
charging is required.
(6) Fill with electrolyte obtained as follows:
To obtain spe-
cific gravity
Add
1 vol.
of
acid
of
(corrected to 1·840 S.G. (corrected
16° C. [60° F.])
of
to 16° C. [60°
F.])
to
For climates
Below 27° C.
(80°
F.)
Above
2r
C.
(80°
F.)
N.I8
These figures
are
given assuming
an
electrolyte tem-
perature
of
16° C. (60° F.).
If
the
temperature
of
the
electrolyte exceeds this ·002
must
be
added
to
hy-
drometer
readings
for
each 3° C. (5° F.) rise
to
give
the
true
specific gravity. Similarly, ·002
must
be
subtracted
from
hydrometer
readings for every
3°
C. (5°
F.)
below
16°
C. (60° F.).
Checking
(4)
The
state
of
charge
of
the battery is indicated by
hydrometer
reading as follows:
For climates below 27° C. (80° F.)
Cell fully charged 1·270
to
1·290
Cell
about
half-charged 1·190
to
1·210
Cell completely discharged 1·110
to
1·130
For climates above 27° C. (80° F.)
Cell fully charged 1·210
to
1·230
Cell
about
half-charged 1·130
to
1·150
Cell completely discharged 1·050
to
1·070
Maintenance
(1)
Keep
the
battery
clean
and
the vent holes
in
the
caps free.
(2) Clean
corroded
terminals with diluted
ammonia
and
smear
them
with
petroleum
jelly.
(3)
Maintain
the
level
of
the
electrolyte
just
above the
tops
of
the
separators.
N
OTE.-Disconnect
the batteryearthcable before
boost-charging the battery
or
using
arc
welding
equipment on the body. Considerable damage
to
the
electrical components will result
if
the ignition is
switched on while the battery remains connected
to
the
car
electrical system.
N
mk1-performance-conversions.co.uk
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