Abstract: A storage battery includes a terminal portion for storage batteries having a plurality of bolt insertion holes bored in one or a plurality of directions, a nut insertion opening through which a nut is inserted, a hollow in communication with the bolt insertion holes and the nut insertion opening and the nut having at least one screw hole threaded in a direction coincident with at least one or the plurality of directions. A fixation portion is formed to fix the nut by deforming the terminal portion with the nut being inserted through the nut insertion opening into the hollow and the at least one screw hole of the nut being in communication respectively with the at least one of the plurality of bolt insertion holes.

Abstract: A storage battery includes a terminal portion for storage batteries having a plurality of bolt insertion holes bored in one or a plurality of directions, a nut insertion opening through which a nut is inserted, a hollow in communication with the bolt insertion holes and the nut insertion opening and the nut having at least one screw hole threaded in a direction coincident with at least one or the plurality of directions. A fixation portion is formed to fix the nut by deforming the terminal portion with the nut being inserted through the nut insertion opening into the hollow and the at least one screw hole of the nut being in communication respectively with the at least one of the plurality of bolt insertion holes.

Abstract: A valve regulated lead-acid battery includes a negative electrode plate, a positive electrode plate, and a solution-retainer interposed between the negative electrode plate and the positive electrode plate and retaining an electrolyte solution. The negative electrode plate includes a surface layer in which Si is contained in an electrode material. An alkali metal element is contained in the electrolyte solution.

Abstract: A valve-regulated lead acid battery comprises an element including a positive electrode plate which retains a positive active material, a negative electrode plate which retains a negative active material, and a separator. An average pore diameter of the negative active material measured by a bubble point method is 0.2 ?m or more and 0.35 ?m or less. An average pore diameter of the separator measured by the bubble point method is 10 to 40 times as large as the average pore diameter of the negative active material.

Abstract: Provided is a terminal portion for storage batteries that allows a nut to be fixed thereto easily and reliably so that the nut does not fall therefrom, and that allows a bolt to be inserted into the nut by selecting either one of the upper surface or the front surface, or two or more points at the same time when connecting an external lead wire to a storage battery even if the nut is fixed to the terminal portion, and a storage battery including such a terminal portion for storage batteries.