This is a 3 part series demonstrating the properties of lead acid batteries. In this video the property know as surface charge is shown as well as how to remove the surface charge. An introduction to some basic lead acid battery concepts and test devices is also provided.
Though I have not found a resource stating this theory, I believe that the surface charge is caused by the capacitive effect of the battery plates. A fully charged battery is experiencing the following condition: The charging current has chemically broken down the lead sulfate on each internal lead plate. The lead sulfate has been turned back into lead and sulfur. The sulfur chemically mixed with the water in the electrolytic solution to create a stronger concentration of sulfuric acid. The lead plated out on the lead plates internal to the battery. The specific gravity (concentration) of the acid can be measured and the SoC (state of charge) determined.
In a capacitor two conductive plates are placed close together but separated by a dielectric material. When a charge is applied to the plates the negative charge on the one plate is attracted to the positive charge on the opposite plate. A similar plate arrangement is found inside a battery. Again I'm completely sure but it stands to reason that this charged plate arrangement is the reason for a surface charge.
Links to all the videos in this series:
Properties of Lead Acid Batteries #1 - Surface charge - • Properties of Lead Aci...
Properties of Lead Acid Batteries #2 - Discharge Amp-Hours - • Properties of Lead Aci...
Properties of Lead Acid Batteries #3 - Charging Amp-Hours - • Properties of Lead Aci...
The load tester used in this video can be bought at:
www.westmountainradio.com
For a wealth of information regarding batteries check out Battery University. It is free. The link below is one of their many pages. This one discusses surface charge.
batteryuniversity.com/learn/ar...