Open circuit voltage OCV - The voltage of a cell or battery with no load attached measured with a voltmeter at room temperature.
Operating voltage - Voltage between the two terminals of the battery with a load connected.
Over-charge - Continuous charging of the battery after it reaches full charge. Generally overcharging will have a harmful influence on the performance of the battery which could lead to unsafe conditions. It should therefore be avoided.
Over-current - Exceeding the manufacturer’s recommended maximum discharge current for a cell or battery.
Over-discharge - Discharging a battery below the end voltage or cut-off voltage specified for the battery.
Oxidation - The loss of electrons by a chemical species