LEAD-ACID BATTERY

A lead-acid battery provided with a negative electrode plate, a positive electrode plate, and an electrolyte solution. The negative electrode plate includes a negative current collector and a negative electrode material. When it is defined in a log differential pore volume distribution of the negative electrode material thata) a region having a pore size of 1 to 3 µm is a P region,b) a region having a pore size of 6 to 15 µm is a Q region,c) a maximum value of the log differential pore volume in the P region is P, andd) a maximum value of the log differential pore volume in the Q region is Q,after initial degradation, during use, or after 1220 cycles in a light-load life test in which charge and discharge of constant current discharge at 25 A for one minute and constant voltage charge at 2.47 V/cell and an upper limit current of 25 A for ten minutes are repeated at a test temperature of 75°C, the log differential pore volume distribution of the negative electrode material has a peak p corresponding to the maximum value P in the P region and a peak q corresponding to the maximum value Q in the Q region, and the maximum value P and the maximum value Q satisfy 0.25 ≤ P/(P + Q) ≤ 0.63.