Gassing
The evolution of gas from one or more of the electrodes in a cell. Gassing commonly results from local action (self-discharge) or from the electrolysis of water in the electrolyte during charging.

Generator
A device that produces an electric current through magnetism.

Gravimetric Energy
The ratio of the energy output of a cell or battery to its weight (Wh/kg). This term is used interchangeably with specific energy.

Ground
To connect to the earth or some conductor which takes the place of the earth.