Brief description of components

An AGM battery can be recognized by its black housing and the lack of a so-called "Magic Eye".

Fig 1: Identifying AGM Battery Components

Courtesy of BMW OF NORTH AMERICA, INC.

Design 

The AGM battery differs from the conventional lead calcium battery as follows:

• Larger plates:

  Larger plates provide for a 25 % higher power density.

• Separators made of glass fibre fleece:

  These provide for up to 3 times higher cycle reliability.

  This in turn improves cold starting performance, current consumption and service life.

• Gas-tight housing with pressure relief valve (see also MODE OF OPERATION ):

  The cell plugs are welded and cannot be opened.

• Acid bound up in the glass fibre fleece:

  The acid is not as previously self-contained in the housing, but 100 % bound up in the glass fibre fleece. This provides increased protection against acid leakage and thus represents a reduced risk to the environment.