E-Rate
Discharge or charge power, in watts, expressed as a multiple of the rated capacity of a cell or battery that is expressed in watt-hours. For example, the E/10 rate for a cell or battery rated at 17.3 watt-hours is 1.73 watts. (This is similar to the method for calculating C-Rate.)

Electric Current
The movement of electrons along a conductor.

Electrochemical Equivalent
Weight of a substance that is deposited at an electrode when the quantity of electricity which is passed is one coulomb

Electrode
The site, area or location at which electrochemical processes take place.

Electrolyte
The medium which provides the ion transport mechanism between the positive and negative electrodes of a cell.

Electron
Negatively charged particle that orbits the nucleus of an atom.

End Voltage Cutoff
The prescribed voltage at which the discharge (or charge, if end-of-charge voltage) of a battery may be considered complete.

Energy
The output capability of a cell or battery, usually expressed in watt-hours.

Energy Density
The ratio of the energy available from a battery to its volume (Wh/L) or weight (Wh/kg).