Sealed lead acid battery
A lead acid battery is a battery which has a stable characteristic at a lower cost as a secondary battery and which is used widely as an electric power source of a movable type for use in a portable electronic apparatus, a starter for automobile or a golf cart and a stationary type for use in a back up electric source for computer. A lead-acid battery can be sealed by utilizing a so-called "oxygen cycle" wherein the oxygen gas generated from the positive plates at the end of charge is recombined by the negative plates. A sealed lead acid battery has a structure in which separators and plates are arranged in stack in sealed cells, and an electrolyte in the battery is retained without flowing in the pores the separators and both. Sealed lead-acid batteries in which oxygen gas generated at the positive electrode during charging of the battery is absorbed by the negative electrode are available in two types, a retainer type and a gel type. The advantages that are provided by sealed lead-acid cells and batteries in comparison to conventional, flooded lead-acid batteries are substantial and varied. The sealed lead acid battery has an advantageous feature of excellent liquid leakage proofness, requiring no water supplement and causing less self-discharge. The advantages that are provided by sealed lead-acid cells in comparison to conventional, flooded lead-acid batteries are substantial and varied. Sealed lead-acid technology thus offers substantial benefits by eliminating maintenance, expense, environmental and safety concerns. The sealed lead-acid stationary batteries used for industrial applications are comprised of from several to a large number of individual sealed lead-acid cells connected to one another to form a battery with the desired capacity and power requirements. Sealed lead-acid batteries are typically used in uninterruptible power supplies. The uninterruptible power source allows for the orderly shut-down of computers when there is a sudden interruption in the primary cycle source, such as during a power outage, and provides back-up power for communications networks.
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