The Definitions of Battery Glossary:

Ampere-hours (Ah):

A measurement of energy is provided to or drawn from a battery.  The Ampere-hours (AH) is referred to the measure of a battery's ability to provide electrical current at a given rate of discharge over time (A current of one ampere for one hour = 1Ah).

Capacity:

The quantity of electricity delivered by a battery under specified conditions, usually expressed in ampere-hours (Ah).

Cycle Life:

The total number of charge/discharge cycles the cell can sustain before it becomes no longer operative (Usually, A battery is considered non-usable if its nominal capacity falls below 60%  ~ 80%).

Electrode:

An electrical conductor through which an electric current enters or leaves a conducting medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum.

Electrolyte:

A chemical compound which, when fused or dissolved in certain solvents, usually water, will conduct an electric current.

Energy density:

The amount of energy a cell can contain.  The energy density is referred to the ratio of cell energy to weight or volume.

Internal resistance:

Resistance to electrical current created by reactance and ohmic resistance.

Load current:

The discharge current delivered to a battery-powered device.

Milliampere-hour:

It is the measurement that describes the battery capacity or rating; it refers to the energy charge that a battery will hold and how long a device will run before the battery needs recharging.

Negative delta V (NDV):

A drop in battery voltage occurs when a sealed NiCAD or NIMH battery reaches the full charge state and goes into overcharge.

Nickel cadmium (NiCAD) battery:

A rechargeable battery is using cadmium as the negative electrode.

Nominal voltage:

The cell voltage is accepted as industrial standard.

Ohmtest^TM:

A measurement is reflecting the internal resistance of a battery.

Primary battery:

The battery is a non-rechargeable battery.

Secondary battery:

A battery is rechargeable by reversing its chemical reaction.

Self-discharge:

The capacities will loss during storage due to the internal leakage between the positive and negative cell plates.

Trickle charge:

A charge is at a low rate, balancing losses through local action and/or periodic discharge to maintain a cell or battery in a fully charged condition.

Voltage:

A unit measures electrical pressure; all batteries are rated in volts DC (Direct Current).

                        Source AmondoTech.Com