New GHU Battery 48 WH 6 Cell Replacement for 68+ 0C52861 0c52862 0c52862 Compatible with Lenovo Thinkpad T440 T440s T450 T450s T550 T560 T460 T460p for L450 L460 L470 T470P W550s X240 X250

Disconnect the AC Adapter from the computer. Power on the system and continuously tap F1 to enter the BIOS. If you receive a general help window, press enter to continue. Use the right arrow key to select the configuration menu. Use the down arrow key to highlight power menu, and press enter. The power sub menu will be displayed. Use the down arrow keys to highlight the disable built in battery option, and press enter. Assure that yes is highlighted and press enter again to power off the system. Allow your system three to five minutes to cool before you open up the cover. Place the unit upside down. Slide the External Battery lock to the unlocked position. Slide and hold the External Battery release latch to the open position. Slide the External Battery out of the chassis. Turn the system over. Insert a straightened paper clip into the release hole of the SIM card tray. Pull the tray fr