Gassing - The production of gas in a battery due to the chemical reaction during recharging.

Gel-Cell Battery - A recombinant-chemistry, lead-acid battery in which the electrolyte is immobilized by adding a gelling agent. Totally sealed and valve-regulated, it is nonspillable and does not require water addition. Gel-cell batteries are used in special applications such as telecommunications, wheel chairs and security alarm systems.

General-Purpose Battery - The least expensive of the typical dry-cell batteries, it has the lowest capacity and is suitable only for low-drain applications, such as TV remote controls, clocks and keyless remotes.

Grid - A lead-alloy framework that supports the active material of a battery plate and conducts current. In SLI batteries, it may contain antimony or calcium to make it more rigid.

Ground - A large conducting body, such as the metal frame of a vehicle, used as a common return for an electric circuit and as an arbitrary zero of potential. When jump starting or installing a battery, it is important to identify the ground cable to avoid damage when attaching the cable to the ground. The negative (-) terminal of the battery is used as the ground in 99% of automotive applications today.

Ground Cable - The cable which connects the ground - e.g., the metal frame of the vehicle - to the battery, normally to the negative (-) terminal.

Group Size - The physical dimensions of a battery. BCI assigns letters and numbers for North American battery size types. All group-size-24 batteries, for example, have similar container dimensions, terminal orientation and terminal types.