Electric power equipment, such as a lawn mower, comprising: a battery tray defining a battery receiving recess having an open upper end, the battery receiving recess having a first end and a second end remote from the first end; a battery configured to be removably received in the battery receiving recess, the battery having a first end and a second end corresponding to the first end and the second end of the battery receiving recess, respectively, a grip being provided at the first end of the battery; an engagement portion provided in a lower part of the second end of the battery receiving recess; a corresponding engagement portion provided in a lower part of the second end of the battery, the corresponding engagement portion being configured to be engaged by the engagement portion of the battery receiving recess against a vertical movement; a first spring member provided in a part of a bottom surface of the battery receiving recess proximate to the first end thereof to urge the battery received in the battery receiving recess upward; and a latch member provided in a part of the battery tray adjoining the first end of the battery receiving recess to selectively retain the battery from an upward movement, characterized in that the electric power equipment further comprises a pair of guide rails provided on the bottom surface of the battery receiving recess and extending from the first end to the second end of the battery receiving recess in a mutually spaced apart relationship, and a pair of guided members provided on a lower surface of the battery and laterally spaced from each other so as to be engaged by a section of the respective guide rails as the second end of the battery is slid from an intermediate part of the bottom surface of the battery receiving recess to the second end of the battery receiving recess, a spacing between the guide rails progressively increasing from a first end of the section on a side of the first end of the battery receiving recess to a second end of the section on a side of the second end of the battery receiving recess, the spacing between the guide rails at the second end of the section being substantially equal to a corresponding spacing between the guided members. a battery tray defining a battery receiving recess having an open upper end, the battery receiving recess having a first end and a second end remote from the first end; a battery configured to be removably received in the battery receiving recess, the battery having a first end and a second end corresponding to the first end and the second end of the battery receiving recess, respectively, a grip being provided at the first end of the battery; an engagement portion provided in a lower part of the second end of the battery receiving recess; a corresponding engagement portion provided in a lower part of the second end of the battery, the corresponding engagement portion being configured to be engaged by the engagement portion of the battery receiving recess against a vertical movement; a first spring member provided in a part of a bottom surface of the battery receiving recess proximate to the first end thereof to urge the battery received in the battery receiving recess upward; and a latch member provided in a part of the battery tray adjoining the first end of the battery receiving recess to selectively retain the battery from an upward movement, characterized in that the electric power equipment further comprises a pair of guide rails provided on the bottom surface of the battery receiving recess and extending from the first end to the second end of the battery receiving recess in a mutually spaced apart relationship, and a pair of guided members provided on a lower surface of the battery and laterally spaced from each other so as to be engaged by a section of the respective guide rails as the second end of the battery is slid from an intermediate part of the bottom surface of the battery receiving recess to the second end of the battery receiving recess, a spacing between the guide rails progressively increasing from a first end of the section on a side of the first end of the battery receiving recess to a second end of the section on a side of the second end of the battery receiving recess, the spacing between the guide rails at the second end of the section being substantially equal to a corresponding spacing between the guided members.