A welding gun, including a contact tip assembly, a diffuser cap, a tip holder, and a shielding gas diffuser, where the shielding gas diffuser includes a casing and an axial tube extending within the casing, and where the casing and the tip holder are connected via a connection system that includes threads with reduced peaks. The sensor also includes an electronics board inside the support ring and attached to planar mounting tabs which provide a stable mounting. The range per full charge value may be calculated based on an amount of usable energy per full charge for an energy storage device and a distance-based energy consumption rate.