Construction laser level

A laser level system (figure 1, 10) comprises a bracket 200 comprising a mounting portion 202 for mounting the bracket to an object or a structure (e.g. a metal beam), and a base portion 201 extending transverse to the mounting portion. A laser level (figure 1, 100) is mounted on the base portion of the bracket and is rotatable relative to the bracket and configured to project at least one laser line. A power source 300, configured to power the laser level, is disposed in the bracket. The power source comprises a battery assembly which is an integral part of the bracket and is not removable from the bracket. The integral battery assembly comprises a battery assembly housing and a plurality of pouch cells housed in the battery assembly housing.