The present disclosure provides a battery and an electronic device, which relate to the technical field of batteries and are used for solving the technical problem of poor sealing performance of batteries. The battery includes a shell, a cover assembly and a coiled core assembly located inside the shell; the shell is provided with an opening, and the cover assembly sealingly covers the opening; the cover assembly includes a conductive member, a top cover and a sealing member between the conductive member and the top cover; the conductive member electrically contacts the coiled core assembly; the sealing member is provided with a first through hole, the top cover is provided with a second through hole, and a diameter of the first through hole is smaller than that of the second through hole.