Tail cap issue - Streamlight ProTac Rail Mount HP-X Pro USB Rechargeable 800 Lumens Weapon Light System

When I got this light I charged up the battery before use like the manual said and then after 5 hours or so of charging it was dark I took it outside clip the tail cap and nothing at first I thought it was the battery but then I grabbed the pressure switch that it came with and it worked just fine so I realized it was the button I contacted Streamlight and they're going to send me another one.