The lead sulfate bridges that form between positive plates and negative plates are derived from the sulfuric acid of the electrolyte, the lead dissolved from the plates, and oxygen derived from the water in the plates as hydrogen is driven off. This conductive material shorts the plates because it grows toward the potential voltage between them. Sponge Lead sulfate is what one plate is made from (today) and sponge lead is the other. (when charged) when discharged both plates become covered with lead sulfate, making only a very damped chemical reaction. Dropping them has a small chance of breaking the "bridge" off of the plates, or exploding the battery right in front center of a human being. Really dead batteries from 70 years ago (I've seen them) had buildup under the plates so thick that the plates were shorted by the sludge in the bottom. Newer batteries have reservoirs under the plates to "store" flaking PbSO4 (lead sulfate). Jim
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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