As automobiles are usually parked longer than they're being driven, the batteries are left discharging for longer periods of time than when they are being charged.

Charging	:	2PbSO4 + 2H20 →  Pb + PbO2 + 2H2SO4
Discharging	:	Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H20

	This causes water and lead sulfate (PbSO4) to form at a faster rate than it can be reconverted back to lead, lead dioxide and water. Lead sulfate that's left sitting, originally spongy, will eventually crystallize. Once in crystal form, the lead sulfated cannot be reconverted, even when the battery is being charged. This causes a reduction in active material (the lead and lead dioxide) and surface area where chemical reaction takes place. Eventually, the battery will no longer have the capability to supply enough cranking current to start a car. This process, also known as sulfation, is the main cause why batteries fail prematurely!
Crystallized Lead Sulfate
The Sulfarid Battery Maximizer generates Amplitude Modulated Pulses (AMP) at the resonance frequency of the crystals to shatter the covalent bonds that hold it together. This allows the lead sulfate to be reconverted once the battery is charged. A battery free from lead sulfate crystals will have its lifespan stretched to its maximum! No more premature failure due to sulfation! Don't just take our word for it. See what the others say about us!       The Star Motor Trader New Straits Times Why not EDTA? EDTA, or ethalene diamine tetra acetic acid has always been known to dissolve the lead sulfate layer on the plates. There are, however, two downsides to this: EDTA usually comes in powder form, or as a solution. With manufacturers tending to favour sealed maintenance-free type batteries, there is no chance to introduce EDTA to the battery in the first place. EDTA works by forming a complex compound with the lead sulfate layer on the plates. While this removes the insulating layer, the active material that had formed lead sulfate will not be reconverted once the battery is charged. In principle, the insulating layer of lead sulfate is removed, but active material is sacrificed in the process.   EDTA reacts with the lead sulfate to form the complex compound below. The plates are cleaned, but active material is not returned to the battery. Complex compound formed by breaking the lead sulfate bond.

Battery life is extended temporarily with the removal of the lead sulfate crystals and increase of reaction surface area, but the lifespan of the battery cannot maximized unlike using Amplitude Modulated Pulses since active material is not returned to the battery.