Patent ID: 8415046

Claim:
An electric tool, comprising: a battery pack that has a substantial T-shape cross section, the battery pack includes a positioning convex portion with a bifurcated configuration that has a substantial U-shape cross section, a rear section, and a pair of grooves being formed in areas between the positioning convex portion and the rear section of the battery pack, respectively; and a battery housing portion, capable of receiving the battery pack therein and formed in a hollow cylinder shape; wherein the battery housing portion includes a pair of orientation regulating members that protrude inwardly from an inwardly facing surface of the battery housing portion and that engage with the pair of grooves, respectively, to regulate the orientation of the battery pack such that the battery pack is regulated to be inserted in only one predetermined orientation, and the battery pack includes a pair of fixing claws that are mounted in the pair of grooves of the battery pack, respectively, and the battery housing portion has a pair of engaging members that are configured to engage with the pair of fixing claws, respectively, and are aligned with the pair of orientation regulating members in a longitudinal direction of the battery housing portion, respectively.