Lenovo IdeaPad 1 Series Hardware Maintenance Manual page 37

Figure 7. Remove five screws and the battery pack for 14–inch models
Screw specifications
M2 x L4
Figure 8. Remove six screws and the battery pack for 15–inch models
Screw specifications
M2 x L4
Go to https://support.lenovo.com/partslookup
replacement part:
Battery pack
Number of screws
5
Number of screws
6
to look up the Lenovo part numbers of the following
.
Chapter 4 Removing a FRU or CRU
31