Does the open-circuit voltage of a lead-acid battery vary?

Experimental results indicate that the open-circuit voltage of the lead-acid battery varies methodically with the charging or discharging rates and the duration since they have been disconnected from the load or charger.

Why are lead acid batteries kept at open circuit voltage for 800 Min?

The batteries were chosen to be kept at open circuit voltage for 800 min because some works have shown that for lead acid batteries, the state of charge can be derived at open circuit voltage when the battery is disconnected from the load for at least two hours and this OCV is linearly proportional to the Depth of Discharge (DOD) .

Do open circuit voltage and energy recovery of lead acid batteries affect health?

It was demonstrated that the magnitudes of open circuit voltage and energy recovery of lead acid battery have relationships with the health status of the battery which if well exploited, can lead to innovations in the science of state of health determination for lead acid batteries.

How does a lead acid battery work?

A typical lead–acid battery contains a mixture with varying concentrations of water and acid. Sulfuric acid has a higher density than water, which causes the acid formed at the plates during charging to flow downward and collect at the bottom of the battery.

How to determine the state of health of lead acid batteries?

Determining the state of health of lead acid batteries is complex and expensive. The open circuit voltage of batteries and their energy recovery ability were exploited. Higher energy recovery capabilities for batteries indicated better state of health. Higher open circuit voltage decrease indicated a bad state of health. 1. Introduction

Does the open circuit voltage of a battery indicate SoC?

In other works, some users have made claims that the open circuit voltage of the battery 24 or more hours after charge has a relation with the electrolyte specific gravity which in turn is an indication of the SOC of batteries .