HP m9550f Upgrading and Servicing Guide - Page 35

3 Place the chassis upright. 4 Replace the side panel and close the computer. See "Opening and Closing the Computer" on page 1. NOTE: If the new card or device does not work, read the card manufacturer's installation instructions and recheck all connections, including those to the card, power supply, keyboard, and monitor. Replacing the Battery A lithium battery on the motherboard provides backup power for the computer timekeeping capability. The battery has an estimated life expectancy of seven years. When the battery starts to weaken, the date and time may become incorrect. If the battery runs out of power, replace it with a CR2032 lithium battery (3 volt, 220mAH rating) or an equivalent battery. WARNING: There is danger of explosion if the battery is incorrectly replaced. Replace it only with a battery of the same or of an equivalent type. Discard used batteries according to the manufacturer's instructions. 1 Prepare the computer to be opened, and then remove the side and front panels. See "Opening and Closing the Computer" on page 1. 2 Gently lay the computer on its side. 3 Remove any cabling, if necessary, so that you can reach the battery. 4 Remove any memory modules, if necessary, so that you can reach the battery. See "Adding Memory" on page 22. 5 To remove the battery, push the latch away from the battery, and then lift the battery out of the socket. 6 Install the new CR2032 battery in the socket, with the positive (+) side facing the latch. 7 Replace any memory modules or cables that you removed. 8 Place the chassis upright. 9 Replace the side panel and close the computer. See "Opening and Closing the Computer" on page 1. Upgrading and Servicing Guide 31