O'Reilly Auto Parts

I bought o'reilly battery. In august it will be 2 years since purchase. Problem I took it to my o'reilly's in russell springs, kentucky, they said battery was fine when checked. The thing is when I have to jump it every time, I get in it to drive. I had to borrow I jumper and it shows my battery dead. My mechanic said the same thing. So, my question is why do they push me off until warranty is no good or what?