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Term Definition
Platinum Series

As pertaining to Concorde Battery Corporation


The electrical term used to denote the voltage relationship to a reference potential (+).

Positive Electrode

See Positive Plate.

Positive Plate

The plate which has an electrical potential higher than that of the other plate during normal cell operation.


Rate at which energy is released or consumed (expressed in watts).

Power Efficiency

The proportion, expressed in percent, of energy recovered from a storage system, i.e: output power divided by input power.


Amount of current, sometimes expressed as a fraction or decimal of the current necessary to discharge the cell in 1 hour, i.e: a fraction of the .C. rate.

Rated Capacity

The number of Ahs a battery can deliver under specific conditions (rate of discharge, end voltage, temperature).


See Capacity, Rated Capacity.

Rechargeable Secondary Cell or Battery

A cell or battery which can be recharged many times after being discharged without appreciable depreciation of capacity.


State in which the hydrogen and oxygen gases normally formed within the battery cell during charging are recombined to form water.


The deep discharge, constant current charge process used to correct any cell imbalance acquired during battery usage.


The capability of a battery system to be charged and discharged.


In a cell, pertains to a safety vent valve which is capable of closing after each pressure release, in contrast to the non resealable vent cap

Reversible Reaction

A chemical change which takes place in either direction, as in the reversible reaction for charging or discharging a secondary battery.

S or SS

as pertaining to Concorde Battery Corporation

Sealed Cells

Cells that are free from routine maintenance and can be operated without regard to position.

Secondary Battery

A system which is capable of repeated use by employing chemical reactions that are reversible, i.e: the discharged energy may be restored by supplying electrical current to recharge the cell.

Self Discharge

The decrease in the state-of-charge of a cell or a battery, over a period of time, due to the internal electro-chemical losses.


An insulating sheet or other device employed in a storage battery to prevent metallic contact between plates of opposite polarity within a cell.

Shelf Life

For a dry cell or battery, the period of time (measured from date of manufacture) at a specified storage temperature after which the cell or battery retains a specified percentage of its original energy content (Also refer to Wet Shelf Life).

Soak Time

The time required for the electrolyte to be absorbed sufficiently into the active materials of the cells after activation to allow the battery or cell to be placed in service.

Specific Energy

The energy storage ability of a battery on a weight basis, usually expressed in watt hours per pound (or kilogram); sometimes given on a volume basis in watt hours per cubic foot (or liter).

Specific Gravity (S.G.)

The weight of the electrolyte is compared to the weight of an equal volume of pure water, used to measure the strength or percentage of sulfuric acid in the electrolyte.

Starved Cell

A cell containing little or no free fluid electrolyte solution; this enables gases to reach electrode surfaces readily, and permits relative high rates of recombination.

State Of Charge (SOC)

The available ampere-hours in a battery at any given time. State-of-charge is determined by the amount of sulfuric acid remaining in the electrolyte (S.G.) at the time of testing or by the stabilized open-circuit voltage.


In its common usage, the term refers to the formation of lead sulfate of such physical properties that it is extremely difficult, if not impossible, to reconvert it to active material.


RG Battery cases swell or bulge when the cell vent valves maintain an internal pressure that is greater than the outer (atmospheric) pressure.

Temperature, Ambient

The average temperature of the battery's surroundings

Temperature, Cell

The average temperature of the battery's components.


An electrical conductor used in a cell to make external electrical connection to the cell plates.

Thermal Runaway

A chain reaction in which the heat generated within the battery by the overcharge current lowers the battery's internal resistance. This, in turn, progressively increases the charging rate and the heat being generated. In the final stages, enough excess heat may be generated to destroy the battery.

Trickle Charging

Method of charging in which a secondary cell or battery is either continuously or intermittently connected to a constant current charging source that maintains the cell in a fully charged condition.

TSO - Technical Standard Order

FAA approval authorizing a manufacturer to produce a product or part to a certain minimum standard. In Concorde's case this is TSO C173 - aircraft batteries.

Vent Cap

The plug on top of a cell. It can be removed to allow for electrolyte level adjustments.

Vent Valve

A normally sealed mechanism which allows the controlled escape of gases from within a cell.

Vented Cell

A heavy duty cell design in which the vent operates at low pressures during the normal duty cycle to expel gases generated in overcharge. A vented cell plate pack contains flat plates, separated by a gas barrier and woven nylon separator, completely immersed in electrolyte. Often called a 'flooded cell.'


A release of gas either controlled (through a vent) or accidental.


Unit of electromotive force, voltage or potential. The volt is the voltage between two points of a conductor carrying a constant current of one ampere, when the power dissipated between these points is one watt.

Voltage Limit

In a charge controlled battery, limit beyond which battery potential is not permitted to rise during or after the charging process.

Voltage Limit

In a charge controlled battery, limit beyond which battery potential is not permitted to rise during or after the charging process.


Term used to denote that the electrolyte in the cell or battery is liquid and free flowing.

Wet Charged Stand

Period of time that a wet secondary cell or battery can stand in charged condition without losing a specified small percentage of its capacity, when stored under specified conditions.


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