Battery Maintenance
i
more drains through into the cell:. Thii will happen when the efectrolyte level
reaches the bottom of the central tube and prevents further escape of air displaced
by the topping up water. By lifting the tube slightly, the small amount of water in
the flange will drain into the cell and the electrolyte level will then be correct.
Checking the Condition of the Battery
Occasionally check the condition of the battery by taking measurements of the
specific gravity of the electrolyre in each of the cells. A small volume hydrometer
is
required for this purpose-this instrument resembles a syringe containing a
graduated float which ind~cates the specific gravity of the acid in the cell from which
the sample has been taken.
DO
NOT
MUW
IN
XX)
MKH
ELECTROLYTE
-
-
-
Fig.
72.
TAKING HYDROMETER READINGS
Measurements should not be taken immediately after the cells have been "topped-up"
as the electrolyte will not be thoroughly mixed.
The space between each separator
is
not wide enough to permit the nozzle of
a
hydrometer to be inserted. Before taking a sample,
tilt
the battery to bring sufficient
electrolyte above the separators.
Specific gravity readings and their indications are as follows:-
...
1.280-1.300
...
.,.
...
...
Cell fully charged.
About 1.210
......
...
...
...
Celi about half discharged.
...
Below 1.1 50
......
...
...
Cell fully discharged.
The reading for each of the cells should be approximately the same.
If one cell gives a value very different from the rest,
it
may be that acid has spilled
or
has leaked from that particular cell, or there may be a short circuit between the
plater. In this case the battery should be examined by a Lucas Service Depot or
Agent.
178
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