Developing. The first cycle or cycles of a new or rebuilt battery to
bring about proper electrochemical conditions to give rated capacity.

Diffusion. Pertaining to movement of acid within the pores of plates.
(See Equalization.)

Discharge. The flow of current from a battery through a circuit,
opposite of "charge."

Dry. Term frequently applied to cell containing insufficient
electrolyte. Also applied to certain conditions of shipment of
batteries.

Electrolyte. The conducting fluid of electro-chemical devices; for
lead-acid storage batteries it consists of about two parts of water to
one of chemically pure sulphuric acid, by weight.

Element. Positive group, negative group and separators.

Equalization. The result of circulation and diffusion within the cell
which accompanies charge and discharge. Difference in capacity at
various rates is caused by the time required for this feature.

Equalizing. Term used to describe the making uniform of varying
specific gravities in different cells of the same battery, by adding
or removing water or electrolyte.

Evaporation. Loss of water from electrolyte from heat or charging.

Filling Plug. The plug which fits in and closes the orifice of the
filling tube in the cell cover.

Finishing Rate. The current in amperes at which a battery may be
charged for twenty-four hours or more. Also the charging rate used
near the end of a charge when cells begin to gas.

Flooding. Overflowing through the filling tube.

Forming. Electro-chemical process of making pasted grid or other
plate, types into storage battery plates. (Often confused with
Developing.)

Foreign Material. Objectionable substances.

Freshening Charge. A charge given to a battery which has been standing
idle, to keep it fully charged.

Gassing. The giving off of oxygen gas at positive plates and hydrogen
at negatives, which begins when charge is something more than half
completed-depending on the rate.

Generator System. An equipment including a generator for automatically
recharging the battery, in contradistinction to a straight storage
system where the battery has to be removed to be recharged.

Gravity. A contraction of the term "specific gravity," which means the
density compared to water as a standard.

Grid. The metal framework of a plate, supporting the active material
and provided with a lug for conducting the current and for attachment
to the strap.

Group. A set of plates, either positi