LEAD ACID STORAGE BATTERY

A lead-acid battery includes: a negative electrode plate; a positive electrode plate; and an electrolyte solution. The negative electrode plate contains a negative electrode material containing a carbon material and an organic expander. The carbon material contains a first carbon material having a particle size of 32 µm or more, and a second carbon material having a particle size of less than 32 µm. A ratio of powder resistance R2 of the second carbon material to powder resistance R1 of the first carbon material: R2/R1 is 15 or more and 155 or less. The organic expander contains lignosulfonic acid or a salt thereof, and a content of the organic expander in the negative electrode material is 0.03 mass% or more and 0.8 mass% or less.