Heat dissipating vent cap for battery

A vent cap for mounting on an electrochemical battery, said vent cap comprising:

• a low-profile, hollow cap body including a top wall and a bottom wall, forming a material holding chamber, and having an inlet aperture formed adjacent one end of said bottom wall and a vent hole spaced away from said inlet aperture;
• connector means for mounting said cap body on top of said battery at a fill opening of said battery, said connector means providing a fluid passage for fluid flow between an interior of said cap body and said battery by means of said inlet aperture;
• and
• a body of acid-resisting material arranged in said material holding chamber and having a surface area on which vapors from said battery can condense to a liquid as they cool during use of the vent cap,
• wherein said cap body in use projects horizontally on one side of said fill opening a substantially greater distance than the cap body projects on the opposite side of said fill opening, said material holding chamber is located above and to said one side of the fill opening, and condensed liquid formed in said material holding chamber during use of the vent cap is able to drain out of said cap body through said inlet aperture.

A combination sight glass and vent cap device for use on an electrochemical battery, said device combination comprising:

• a cap body having a top and a bottom and forming a material holding chamber, an inlet aperture being formed in said bottom, and a vent hole being provided in said cap body to allow gas to exit from the cap body;
• connector means for mounting said cap body on top of said battery at a fill opening of said battery, said connector means providing a fluid passage for fluid flow between an interior of said cap body and said battery by means of said inlet aperture;
• a body of acid-resisting material arranged in said holding chamber to provide a surface area on which vapors from said battery can condense as they cool during use of the device;
• and
• a light transmitting sight member mounted in said cap body and extending through said inlet aperture and said fluid passage, said sight member having a top end that is visible to a user when said vent cap is mounted on top of said battery and having a lower end arranged and adapted to project into electrolyte liquid in a cell of said battery during use of said device provided there is a predetermined minimum amount of the electrolyte liquid in said cell.