11V

11V denotes a voltage of eleven volts, a unit of electrical potential difference. The volt is the SI unit used to quantify how much energy is carried by each coulomb of charge and is central to describing electrical power systems, batteries, and electronic devices.

In automotive and other DC power systems, 11–14V is a common operating range for a nominal 12V system. When the engine is off, a healthy lead-acid car battery typically measures about 12.6V or higher; readings around 11V usually indicate a discharged or weak battery. With the engine running, the charging system (alternator) generally maintains voltage around 13.8–14.4V to replenish the battery and supply electrical loads. Voltage measurements outside these ranges can signal a failing battery, poor connections, or charging-system issues.

In rechargeable battery technology, 11.1V is a typical nominal voltage for a three-cell (3S) lithium-ion pack (3 × 3.7V). Such packs are commonly charged to about 12.6V (4.2V per cell) and may be considered exhausted near 9.0–9.5V, depending on the protection circuitry and chemistry. Other battery chemistries and configurations use different nominal voltages, so “11V” may appear as a nominal value in specific designs or devices.

Voltage can be measured as direct current (DC) or alternating current (AC), though 11V is most commonly encountered as DC in batteries and vehicle systems. Accurate reading requires a properly functioning multimeter and correct connection, since voltage is sensitive to load, temperature, and measurement method.