Electric wrench with built-in battery

An electric wrench comprising:

• a tool head unit;
• a wrench body unit connected to said tool head unit, and defining an accommodating space that extends along a first axis;
• an output unit including a head driver that is mounted to said tool head unit, that extends along a second axis being transverse to the first axis, and that is configured to rotate in a selected direction and output rotational energy;
• a handle unit connected to said wrench body unit and being opposite to said tool head unit along the first axis;
• an electric unit mounted in said accommodating space, being proximate to said tool head unit, and operable for driving rotation of said head driver;
• and
• a control unit mounted on said wrench body unit, and including
• a display that is configured to display an output value,
• a control module that is disposed in said accommodating space and that is signally connected to said electric unit and said display, and
• a battery module that is disposed in said accommodating space between said electric unit and said handle unit, that is electrically connected to said control module, and that has at least one battery configured to provide electric energy to said electric unit and said display;
• wherein said electric unit, said battery module and said handle unit are arranged along the first axis.