Apple Mac Pro (Early 2009) - Manual (Page 74)

74 Chapter 3 Making a Good Thing Better
Replacing the Internal Backup Battery
Your Mac Pro uses a BR 2032 Lithium battery that preserves settings, such as the date
and time, when your Mac Pro is off. If you notice intermittent problems when your
Mac Pro starts up or changes in the date and time settings, replace the battery.
Important: Dispose of the old battery according to your local environmental laws.
To replace the battery:
1 Open your Mac Pro and remove the side panel, following the instructions on page 37.
2 Remove any PCI Express cards that block access to the battery. See “Adding PCI Express
Cards” on page 69 for instructions.
3 Remove the old battery from the holder.
WARNING: Installing the battery incorrectly may cause an explosion. Use only the
same type of battery or an equivalent recommended by the manufacturer of the
original.