If no diagnostic program is installed on the computer, the customer should download and install the program to diagnose the battery, before getting a non-physically damaged battery replaced. Note that the replacement of a physically damaged battery is not covered by the warranty. Removal steps of the built-in battery DANGER Use only the authorized battery specified for your computer. Any other battery could ignite or explode. Step Screw (quantity) Color Torque 2 M2 × 3 mm, small-head, nylon-coated (2) Black 0.181 Nm (1.85 kgf-cm) 1130 Smart-card reader assembly Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page 64. For access, remove these FRUs in order: • “1010 Removable battery” on page 64 80 T480 Hardware Maintenance Manual