Abstract: A secondary battery system of the present disclosure includes a secondary battery and a heating device, wherein the secondary battery includes a positive electrode and a negative electrode, and one or both of the positive electrode and the negative electrode include an active material and a granulated body, the active material includes a material whose volume changes with charge and discharge of the secondary battery, the granulated body includes an inorganic solid electrolyte and an alkali metal-containing salt, and a target heated by the heating device includes the alkali metal-containing salt.

Abstract: A multi-agent type hair treatment agent comprising a first composition containing component (A) and component (B); and a second composition containing component (C), wherein the weight ratio (H)/(C) of component (H) to component (C) in the second composition is less than 1. A hair treatment method comprising the steps of applying and rinsing the first composition to hair (i) and then applying the second composition to hair (ii). Component (A): a carboxylic acid having an inorganic value of 230 or more and 450 or less and an organic value of 50 or more and 250 or less, or a salt of the carboxylic acid Component (B): anionic surfactant Component (C): an aromatic sulfonic acid having a molecular weight of 300 or less or a salt thereof Component (H): cationic surfactant.

Abstract: A multi-agent type hair treatment agent comprising a first composition containing component (A) and component (B); and a second composition containing component (C), wherein the weight ratio (H)/(C) of component (H) to component (C) in the second composition is less than 1. A hair treatment method comprising the steps of applying and rinsing the first composition to hair (i) and then applying the second composition to hair (ii).