To provide a lead battery having a control valve of a longer service life.

A grid structure that comprises 0.9 to 2.5 wt.% of tin, and a weight ratio of calcium and tin is 0.09 or lower, is employed as a positive electrode plate, as well as a divided value of a totalized value for all the cross sections of a longitudinal frame in a longer side direction of the grid structure by a length of the longer side of the grid structure is 0.15 mm or larger, and a distance between the longitudinal frame is made to be 20 mm or less. Keeping the density of an active substance for the positive electrode after making a battery jar to be 3.5 to 4.4 g/ml, the lead battery with the control valve in which the pressure for a group of the electrode plates is 20 kPa or higher, is assembled.