Battery Life
The battery life on all Aimpoint optics are defined at a specific intensity setting, at room temperature, using a quality battery. There are multiple scenarios that may cause a shortened battery life.
Those include but are not limited to (1) leaving the sight set to one of the highest brightness settings for an extended period, (2) defective or depleted battery installed initially, or (3) the optic/battery was stored in an area with extremely high or low ambient temperature.