This value (expressed in volts) is either added or subtracted from the observed battery voltage based on the associated temperature. The BMS determines which voltage adjustment parameter to use by taking the average battery pack temperature.
This setting allows for compensation on batteries that have a higher or lower observed voltage in various different temperatures (EG: a battery in the cold might register 3.1v whereas in warmer temperatures it might register 3.3v). This compensation is only taken into account for voltage-based State of Charge (SOC) drift and does not factor in to maximum / minimum voltage limits or protection.
NOTE: Most Lithium-Ion batteries do not need this voltage adjustment. Other battery chemistries such as NiMH based batteries are more likely to need it.
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