06 Predator battery problem

I have an 06 troy Lee 500 and my battery will not charge. the battery is burnt out after 4 hours of riding. I have a new rectifier and sent stator to have it rebuilt and the company I sent it to said stator was fine. Took quad to a local repair shop and they told me what i already knew that stator and rectifier are fine. What else will kill my battery to the point it needs to be replaced every time I ride? Also how does one check this. It comes from rectifier and goes to battery, my guess it that it takes the dc power from rectifier and goes to the battery to charge. Could this be bad?


thank you