Sealed Lead
2010
Can the Lead Acid battery compete in modern times?
The Lead Acid is the oldest rechargeable battery. Invented by the French physician Gaston Planté in 1859, lead acid serves stationary or wheeled applications where weight and size are of lesser concern. Today, the flooded lead acid battery is used in automobiles, forklifts and large uninterruptible power supply (UPS) systems (SONY VAIO VGN-FZ Battery).
During the mid 1970s, the maintenance-free lead acid battery was developed that could operate in any position. The liquid electrolyte was transformed into moistened separators and the enclosure was sealed. Safety valves were added to allow venting of gas during charge and discharge (SONY VGP-BPS8 Battery).
Two designations of sealed lead acid batteries have emerged: the sealed lead acid (SLA), also known as Gelcell, which serves predominantly in wheeled mobility, and the large valve regulated lead acid (VRLA), which is used for stationary applications. This article focuses on the SLA .
The SLA is not subject to memory. Leaving the battery on float charge for a prolonged time does not cause damage. The battery’s charge retention is best among rechargeable batteries. Whereas the NiCd self-discharges 40 percent of its stored energy in three months, the SLA self-discharges the same amount in one year. The SLA is relatively inexpensive to purchase but the operational costs can be more expensive than the NiCd if full cycles are required on a repetitive basis .
The SLA does not lend itself to fast charging — typical charge times are 8 to 16 hours. The SLA must always be stored in a charged state. Leaving the battery in a discharged condition causes sulfation, a condition that makes the battery difficult, if not impossible, to recharge .
Unlike the NiCd, the SLA does not like deep cycling. A full discharge causes extra strain and each discharge/charge cycle robs the battery of a small amount of capacity. This wear-down also applies to other battery chemistries in varying degrees. To prevent the battery from being stressed through repetitive deep discharge, a larger SLA battery is recommended .
About the Author
Support Windows 7SONY VGP-BPS8 Battery Replacement http://www.battery-retail.com/sony-vgp-bps8-battery.htmSONY VAIO VGN-FZ Battery Replacementhttp://www.battery-retail.com/sony-vaio-vgn-fz-battery.htmSONY VGP-BPS11 Battery Replacementhttp://www.battery-retail.com/sony-vgp-bps11-battery.htm
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