Dell DAE2-ATA Hardware Reference Manual page 14

Warnings and Cautions
Static Precautions
Replacing a Lithium Battery
xiv
2-Gigabit Disk-Array Enclosure (DAE2) Hardware Reference
EMC incorporates state-of-the-art technology in its designs, including
the use of LSI and VLSI components. These chips are very susceptible
to damage caused by static discharge and need to be handled
accordingly.
CAUTION
!
Before handling printed-circuit boards or other parts containing
LSI and/or VLSI components, observe the following precautions:
Store all printed-circuit boards in antistatic bags.
Use a ground strap whenever you handle a printed-circuit
board.
Unless specifically designed for nondisruptive replacement,
never plug or unplug printed-circuit boards with the power on.
Severe component damage may result
Some EMC products include lithium batteries that only trained
personnel should change or replace.
WARNING
Danger of explosion if battery is incorrectly replaced. Replace only
with the same or equivalent type recommended by the equipment
manufacturer. Discard used batteries according to manufacturer's
instructions.