At PF, we require links to reputable sources for this. "I have heard" is generally not good in the technical forums. ThanksJulesP said:
A lead acid battery flyback pulse is a sudden surge of electrical energy that occurs when a lead acid battery is disconnected from a power source. This pulse can cause damage to the battery and can also lead to the decomposition of the electrolyte solution.
The flyback pulse causes electrolyte decomposition by creating a high voltage spike that can exceed the battery's voltage rating. This can cause the electrolyte solution to break down into its component gases, hydrogen and oxygen. This process is known as electrolysis and can lead to a loss of electrolyte and reduced battery performance.
Electrolyte decomposition can have several negative effects on a lead acid battery. It can reduce the battery's capacity and overall performance, shorten its lifespan, and increase the risk of internal damage and failure. It can also create a safety hazard due to the release of flammable gases.
The flyback pulse and electrolyte decomposition can be prevented by using a flyback diode or a snubber circuit to suppress the voltage spike. Properly maintaining the battery, such as avoiding overcharging and ensuring proper ventilation, can also help prevent these issues.
Some signs that a lead acid battery has experienced electrolyte decomposition include a decrease in battery capacity, increased self-discharge, and corrosion on the battery terminals. The battery may also produce a strong smell of sulfuric acid or emit gas bubbles when charging.