Dell UPS 1920T - Manual (Page 18)

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Installation
NOTE: A small amount of arcing may occur when connecting the batteries. This is normal and does not damage
the unit or present any safety concern.
4 Connect the internal battery connector (see Figure 12).
Figure 12. Connecting the Internal Battery Connector
5 Replace the metal battery cover.
Torque the screw to 0.7 Nm (6.2 lb in).
6 Replace the UPS front cover.