1. General
The model PUZ7E (see Fig. 1) is a "dry
charged" battery and is supplied without
electrolyte but with its plates in a charged
condition. When the battery is required for
service it is only necessary to fill each cell with
sulphuric acid of the correct specific gravity. No
initial charging is required.
2. Preparation for Service
The electrolyte is prepared by mixing together
distilled water and concentrated sulphuric acid,
using lead-lined tanks or suitable glass or
earthenware vessels. Slowly add the acid to the
water, stirring with a glass rod. Never add water
to the acid, as this causes dangerous spurting of
the concentrated acid. The specific gravity of the
filling electrolyte depends on the climate in
which the battery is to be used.
Heat is produced by the mixture of acid and
water, the electrolyte should be allowed to cool
before pouring it into the battery.
The specific gravity of the electrolyte varies
with the temperature. For convenience in
comparing specific gravities, they are always
corrected to 60°F, which is adopted as a reference
temperature.
The method of correction is as follows:-
For every 5°F. below 60°F., deduct 002 from
the observed reading to obtain the true specific
gravity at 60°F. For every 5°F. above 60°F. add
.002 to the observed reading to obtain the true
specific gravity at 60°F.
The temperature must be that indicated by a
thermometer having its bulb actually immersed in
the electrolyte and not the ambient temperature.
Fill the cells to the tops of the separators, in one
operation. The battery filled in this way is 90%
charged. When time permits, a short freshening
charge for no more than four hours at the normal
recharge rate of 1.5 amp. should be made.
3. Routine Maintenance
Fortnightly (or more frequently in hot climates)
examine the level of electrolyte in the cells and if
necessary add distilled water to bring the level up
to the tops of the separators. The use of a Lucas
Battery Filler will be found helpful, as it ensures
that the correct electrolyte level is automatically
maintained and also prevents distilled water from
being spilled on the top of the battery (see Fig. 2).
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