89Backup batteryThe lithium battery on the mainboard powers the real-time clock (RTC)in the absence of power. When the battery starts to weaken, it losesvoltage, and the server settings stored in CMOS RAM in the RTC (forexample, the date and time) might be incorrect.For a list of approved replacement batteries, contact your customerservice representative or dealer.Warning! Danger of explosion if battery is incorrectlyreplaced. Replace with only the same or equivalent typerecommended by the manufacturer. Dispose of usedbatteries according to the manufacturer's instructions.Replacing the battery1 Before proceeding, record your custom BIOS settings.2 Disconnect the AC power cords from the power source or walloutlets.3 Turn off all peripheral devices connected to the server system.4 Remove the following:a Rear access panel - refer to page 44b System board access panel - refer to page 51c Memory board - refer to page 52d Air baffle - refer to page 54e Processor board - refer to page 555 Slide the battery in the direction shown in Figure 44, allowing thebattery to pop up.
