Abstract: A storage battery is provided which includes a casing and a cover secured to the casing. The cover includes a body having a top surface and a peripheral skirt; the top surface having a plurality of vent apertures, at least one negative terminal and at least one positive terminal, and an elongated recess having a bottom, four side walls and an open top. The negative and positive terminals have extensions exposed at opposite ends of the recess, and a state-of-charge indicator assembly is mounted in the recess and electrically connected to the negative and positive terminal extensions. The state-of-charge indicator assembly is sealed in the recess by relatively thin adhesive seal or membrane applied over the open top and adhered to the top surface of the cover. The membrane is provided with percent charge and test switch indicia thereon.

Abstract: In a method of forming expanded metal mesh from a deformable strip which includes the steps of preforming and slitting the strip by intermeshing tooth segments of at least an upper disk and a lower disk with the strip passing therebetween, wherein the tooth segments each include linear leading and trailing surfaces joined at an apex defining a nose angle, and intersecting respective tangents to a radius of the disk at circumferentially spaced locations defining entry and exit angles, respectively, an improvement which includes selecting the exit angle in accordance with the formula: ##EQU1## where R=radius of tooth root;D=depth of tooth; andT=strip thickness.

Abstract: A method and an apparatus for expanding a preslit deformable mesh sheet and an improved battery grid are disclosed. The method comprises the steps of positioning the lateral edges of the deformable strip with the same horizontal plane; laterally expanding the preslit portion of the strip while maintaining the lateral edges within the said horizontal plane; and vertically expanding the preslit portion of the strip selectively and concurrently with the lateral expansion thereof while maintaining the lateral edges in the horizontal plane. The apparatus comprises means for diverting one lateral edge from the other and laterally expanding the preslit portion of the deformable strip, while maintaining the lateral edges within the same horizontal plane, and means for vertically expanding the preslit portion of the deformable strip selectively and concurrently with the lateral expansion.

Abstract: A unique alloy comprising lead with small additions of zinc and tin is used to make grids for lead acid cells. The alloy as produced is softer than is desirable. It is hardened by mechanical working. When properly worked, it has a strength and stiffness approaching that of other low alloy lead materials currently in use as storage battery grids.

Abstract: A unique alloy comprising lead with small additions of zinc and tin is used to make grids for lead acid cells. The alloy as produced is softer than is desirable. It is hardened by mechanical working. When properly worked, it has a strength and stiffness approaching that of other low alloy lead materials currently in use as storage battery grids.