| Word | Description |
| Battery | A device that produces and stores electrical energy as a result of a chemical reaction. A 12-volt battery has six individual 2-volt cells that contain positive (+) plates and negative (-) plates that create electrical current. A fully charged 12-volt battery produces at least 12.66 volts. |
| Battery Charge | See State of Charge. |
| Battery Council International (BCI) | An association of battery industry companies whose members establish policy and standards for the industry. |
| Battery Group Size | See Group Size. |
| BCI | Battery Council International (BCI) - An association of battery industry companies whose members establish policy and standards for the industry. |
| BCI Group Number | See Group Size |
| Boost Charging | Charging at an extremely high rate of 50-300 amps, this method is primarily used to rapidly charge a battery in order to start a vehicle in a matter of a few seconds to five minutes. |
| Button Cell | A single-cell, miniature battery, such as a watch battery, that is the size and shape of a button. |