Dell PowerEdge C6220 Hardware Owner's Manual page 215

Figure 3-56. Replacing the System Battery
1 system battery
3 negative side of battery connector
6 Replace the system-board assembly. See "Installing a System-Board
Assembly" on page 143.
7 Enter the System Setup program to confirm that the battery is
operating properly. See "Using the System Setup Program" on page 58.
8 Enter the correct time and date in the System Setup program's Time
and Date fields.
9 Exit the System Setup program.
2 positive side of battery connector
Installing System Components | 215