What does the abbreviation OCV mean and what does it tell me concerning the battery?
OCV stands for Open Circuit Voltage – the voltage in an open circuit. Other common terms are "off load voltage" or "voltage without load". As the name indicates, OCV is the voltage measured between the two poles of the battery when the battery is not under load (no current consumption).
The OCV changes on completion of the charging or discharging process due to the effects of polarization and diffusion. The battery should be set aside, in a state of rest, sometimes up to a few days, until it reaches a stable state. If the OCV is measured shortly after a charging or discharging process, it will not be possible to obtain a correct value for the state of charge.