| Word | Description |
| Valve-Regulated Lead-acid Battery (VRLA) | A lead-acid battery that is sealed with the exception of a one-way valve that opens to the atmosphere when the internal gas pressure in the battery exceeds the atmospheric pressure by a pre-selected amount. VRLA batteries are sometimes called recombinant batteries |
| Vented Battery | A battery in which the gaseous products of electrolysis and evaporation are allowed to escape into the atmosphere as they are generated. These batteries are commonly referred to as flooded batteries |
| Venting | When gas or electrolyte escapes through a valve or vent |
| Volt (E) | The unit of measure for electrical potential or pressure, which is also called electromotive force (EMF). Volts = Amps x Ohms |
| Volt-ohm-meter (VOM) | multimeter |
| Voltage | Also called electromotive force (EMF), it is the electrical pressure that forces electron flow in a complete circuit |
| Voltage Drop | The net difference in the electrical potential (voltage) when measured across a resistance (ohms). Its relationship with current is described in Ohm's Law |
| Voltage Regulator | A device that limits the charging voltage in a circuit |
| Voltmeter | An instrument used to measure the voltage in a circuit or the state of charge of a battery by measuring its open-circuit voltage |
| VOM | Volt-ohm-meter See Multimeter |
| VRLA | valve-regulated lead-acid battery |