The invention discloses a steel shell for containing a battery and an electric device with the steel shell. The steel shell comprises a steel shell body and a cover body, wherein one end of the steel shell body is opened; the cover body is arranged at the opening; a conductive support part for supporting a battery is arranged at the bottom inside the steel shell body; the support part can control batteries of different diameters within different height ranges. As the support part can provide different support heights according to different diameters of the batteries, the steel shell is applicable to batteries of different diameters and heights and also applicable to batteries in poor appearance or welded batteries, and thus battery waste can be avoided.