About Our Notebooks:All of our refurbished notebooks undergo a rigorous testing and verification process. After a thorough testing and diagnostic procedure, each individual notebook is put through a continuous 24 hour stress test. At the end of this 24 hour burn, the notebooks are once again run through testing and diagnostics before being thoroughly cleaned and ready for shipment. Each notebook is backed by a 3 year and 30 days on battery over the counter warranty.