Power tool having a hammer mechanism

A power tool, comprising:

• a motor having a motor shaft that rotates around a motor axis;
• a hammer mechanism that includes a cylinder and a hammer element adjacent to an air chamber defined within the cylinder and converts rotary motion of the motor shaft to linear motion of the hammer element along a hammer axis by utilizing action of an air spring of the air chamber;
• a housing that (i) has a front-end part including a front-end surface and to which a tool accessory is mounted, and a rear-end part including a rear surface on the opposite side to the front-end surface, and (ii) houses the motor and the hammer mechanism;
• and
• a handle that is configured to be held by a user,
• wherein:
• the motor axis and the hammer axis are parallel to each other,
• a rearmost part of the handle is arranged on the rear-end part of the housing, and
• the rearmost part of the handle is connected to at least part of a battery mounting part that is provided on the rear-end part of the housing and configured such that a battery for supplying power to the motor is removably attachable thereto.