Fujitsu PRIMERGY TX300 S6 Options Manual page 80

Installing a BBU Expansion cards and BBU
The BBU carrier plate can accommodate up to three BBUs.
Figure 52: Position of used holes on the BBU carrier plate
First installed BBU: use the blue marked holes to install the BBU.
Second installed BBU: use the yellow marked holes to install the BBU.
Third installed BBU: use the green marked holes to install the BBU.
80 Options Guide
TX300 S6