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Battery Terms and Definitions
  • Absorbent Glass Mat

    (AGM) A separator technology used in some sealed lead-acid batteries in which the glass-mat separator absorbs 100% of the electrolyte. Because of the immobilized electrolyte, an AGM battery will not leak or spill and does not require water addition.

  • Ah

    Ampere-Hour.

  • AGM

    Absorbent Glass Mat.

  • Acceptance Test

    A capacity test of a new battery at either a constant current (expressed in amperes) or constant power (expressed in watts) rate to determine if it meets the user's specification or manufacturer's ratings.

  • Accumulator

    See Battery.

  • Active Material

    The chemical paste that adheres to the positive (+) and negative (-) electrodes in a battery and reacts with the sulfuric acid to produce a current.

  • Alternating Current

    (AC) An electric current that varies periodically in magnitude and direction, measured in hertz. A battery does not deliver alternating current.

  • Ampere

    (Amp) The unit of measure for the amount of current that is flowing through a circuit.

  • Ampere-Hour

    (Ah) (Amp-Hour) The product of multiplying the ampere flow by the time over which it flows. Example: A battery delivering 10 amps for 20 hours = 10 amps x 20 hours = 200 AH.

  • Alkaline Battery

    A nonrechargeable, dry-cell battery — such as a AA, AAA, C, D or 9-volt battery — that uses alkaline aqueous solution for its electrolyte. It has a greater capacity than some other types of dry-cell batteries.