Reassembly Notes • If you are installing a new battery, first snap the correct panel onto the front of the battery. For a 12-inch display, use the flat battery panel—for a 13-inch display, use the curved battery panel. To remove a panel, slide it open, then twist the upper edge of the panel off the battery. Figure 2-2. Installing a Battery Panel • Make sure the front panel of the battery is open before inserting the battery. 2-4 Removal and Replacement HP OmniBook 900