Dell XPS 14 (L401X, Late 2010) - Manual (Page 51)

Coin-Cell Battery 51
7 Replace the memory module(s) (see "Replacing the Memory Module(s)"
on page 17).
8 Replace the battery (see "Replacing the Battery" on page 14).
CAUTION: Before turning on the computer, replace all screws and ensure that no
stray screws remain inside the computer. Failure to do so may result in damage to
the computer.