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The lead–acid battery was invented in 1859 by French physicist Gaston Planté and is the oldest type of rechargeable battery. Despite having a very low energy-to-weight ratio and a low energy-to-volume ratio, its ability to supply high surge currents means that the cells have a relatively large power-to-weight ratio. These features, along with their low cost, makes it attractive for use in motor vehicles to provide the high current required by automobile starter motors.
As they are inexpensive compared to newer technologies, lead-acid batteries are widely used even when surge current is not important and other designs could provide higher energy densities. Large-format lead-acid designs are widely used for storage in backup power supplies in cell phone towers, high-availability settings like hospitals, and stand-alone power systems. For these roles, modified versions of the standard cell may be used to improve storage times and reduce maintenance requirements. Gel-cells and absorbed glass-mat batteries are common in these roles, collectively known as VRLA (valve-regulated lead-acid) batteries.
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Academy Award(R) winner Denzel Washington (Best Actor) joins forces with blockbuster producer Jerry Bruckheimer and mega-hit director Tony Scott for DEJA VU — the powerful, fast-paced action-thriller with a spectacular mind-bending twist. Called in to recover evidence in the aftermath of a horrific explosion on a New Orleans ferry, Federal agent Doug Carlin (Washington) gets pulled away from the scene and taken to a top-secret government lab that uses a time-shifting surveillance device to help prevent crime. But can it help Carlin change the past? Hold on to your seat for an explosive and intriguing thrill ride you’ll want to experience again and again.