A subject for the invention is to provide an electrolyte solution and a secondary battery which are preventd from causing or suffering battery performance deterioration in high-temperature storage or high-temperature trickle charge. The device includes a hollow needle and a housing on which the needle is releasably mounted. Superior conditioning is obtained by providing a cationic polymer to the hair while it is subjected to the oxidising treatment, and then the oxidised hair is subjected to a conditioning treatment with a composition comprising a functionalized silicone.