IdeaPad U350 8Cell Li Battery provides the longest run time for your IdeaPad U350 notebook.Delivers up to 3.5 hours of system run time Over-discharge protection Offers proven battery technology with balanced performance, capacity and longevity Backed by a 1-year limited warranty with renowned Service and Support from Lenovo Note: Battery life will vary based on many factors, including brightness, applications, power management, battery conditioning and customer preferences.