Dell PowerEdge M420 Hardware Owner's Manual - Page 245

Blade System Board NVRAM Backup Battery The NVRAM backup battery is a 3.0-volt (V), coin-cell battery. Removing and Installing the NVRAM Backup Battery WARNING: There is a danger of a new battery exploding if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer's instructions. See the safety instructions that came with your system for additional information. 1 Remove the blade. See "Removing a Blade" on page 145. 2 Open the blade. See "Opening the Blade" on page 149. 3 If you are replacing the battery in a PowerEdge M910, M905, M805, M710HD, M610x, or M605 system, you must remove the system board to access the battery. See "Blade System Board" on page 255. 4 Remove the battery by lifting it straight up from its connector. See Figure 3-52. See Figure 7-1 (PowerEdge 910), Figure 7-2 (PowerEdge M905), Figure 7-3 (PowerEdge M805), Figure 7-4 (PowerEdge M710), Figure 7-5 (PowerEdge M710HD), Figure 7-6 (PowerEdge M610), Figure 7-7 (PowerEdge M610x), Figure 7-11 (PowerEdge M605), or Figure 7-12 (PowerEdge M600) to locate the battery on the blade board. 5 Install the new battery with the side labeled "+" facing up. See Figure 3-52. Installing Blade Components 245