Go to
https://support.lenovo.com/partslookup
replacement part:
Battery pack
Remove the M.2 solid-state drive
Make sure the following FRU (or CRU) have been removed.
"Remove the ODD" on page 28
"Remove the lower case" on page 29
Step 1.
Disconnect the battery pack cable from the system board.
Attention: Do not pull the cable. Use your fingernail to disconnect the cable.
Figure 8. Remove the battery pack cable
Step 2.
Remove one screw and slide the M.2 solid-state drive out of the slot.
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Lenovo IdeaPad L3i (15", 6) Hardware Maintenance Manual
to look up the Lenovo part numbers of the following