National Automotive Parts Association / NAPA Auto Parts

I purchased a lawn mower battery from this store about 2 months ago I went to exchange it because it would not stay charged, the lady at the counter who's name is holy stated to me in a very very rude way that all she could do was take my battery as a core charge and I would have to buy a new one. Don't Napa have some kind of warranty with there batteries.jesus Christ I will never do bussiness with Napa again and I hope this will denture other people from buying at Napa.thank you for your time