Warranty upgrade for 3 year Depot base warranty models.Lenovo Onsite Warranty provides for dispatch of a Lenovo technician to your site to provide repair of your system in the event of an issue. Onsite service is an upgrade to the standard service level available on most mobile systems and it is the base service level on most desktop systems.The Sealed Battery Warranty offers a one-time replacement in the event a covered battery fails to meet minimum performance standards. Ideal for executives and small business owners where PC system availability is vital to daily business operations, it is ideal for customers with limited IT budgets who require reasonable and predictable IT expenses, where the unplanned expenses due to battery replacement may prove to be problematic.