No Lenovo experience but my Sony VAIO SZ270P battery died after 6 months. Sony Replaced it. Second one died after another 6 months. Sony would not replace it. Sonystyle.com was out of them. Best Buy sold Sony SZ but not the batteries. My local Batteries+ sold them but was out. They offered to FedEx it for next day delivery at no charge for the shipping and they did. It was Rayovac brand but recognized by the notebook and has lasted 1 yr 10 months so far.