• Sealed lead-acid (SLA) batteries, also called valve-regulated lead-acid (VRLA) batteries, are rechargeable packs used for a variety of electronic applications. Unlike auto batteries, SLAs won't leak acid and can be used in non-vertical positions. They can deliver large currents for short periods, such as for emergency floodlights and computer backup power.


    A sealed lead-acid battery is a convenient, off-the-shelf means of storing and delivering electric current. A sturdy, leak-proof metal or plastic box houses the active components.


    The battery uses two kinds of lead plates having different chemical treatments. One set connects to the positive terminal, the other to the negative terminal.


    Every battery has a chemical liquid, or electrolyte, that facilitates the production of electric current. In a lead-acid battery, the electrolyte is sulfuric acid.


    A pressure-relief valve vents hydrogen gas created during charging. The valve opens only if the inside pressure becomes dangerously high. Normally, the battery stays sealed and won't leak if it's turned upside-down.


    The lead plates are held apart by plastic or fiberglass pads called separators. They keep the plates from short circuiting and slow down chemical deterioration.


    Electropaedia: Lead Acid Batteries

    CD Technologies: VRLA Batteries and Their Application

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