| Word | Description |
| OCV | open-circuit voltage |
| Ohm | The unit of measure for resistance within an electrical circuit. Its symbol is the Greek letter omega. |
| Ohm's Law | An equation — E (Volts) = I (Current) x R (Resistance) — that expresses the relationship between volts, amps and ohms in an electrical circuit with resistance. |
| Ohmmeter | An instrument used to measure resistance in an electrical circuit |
| Online Customer Service | Online Customer Service can assist you with any online purchase made at InterstateBatteries.com. You can contact them by phone at 866-842-5368 or by sending an email to CustomerService@InterstateBatteries.com. Online Customer Service is available Monday - Friday, 8:00am - 5:00pm Central Time, excluding holidays. |
| Open Circuit | A circuit that has a broken or interrupted path, preventing current flow |
| Open-Circuit Voltage (OCV) | The no-load voltage of a cell or battery measured with a voltmeter. See also Closed-Circuit Voltage |
| Overcharging | The forcing of current through the battery after it is fully charged. Overcharging reduces service life and can damage the battery. |