Remove The Upper Case - Lenovo Yoga Slim 7i Pro Hardware Maintenance Manual

Figure 26. Disconnect the coin-cell battery cable
Go to https://support.lenovo.com/partslookup
replacement part:
System board

Remove the upper case

Make sure the following FRUs (CRUs) have been removed.
"Remove the lower case" on page 30
Step 1. Disconnect the battery pack cable.
Attention: Use your fingernail to pull the connector to unplug it. Do not pull the cable.
Figure 27. Disconnect the battery cable
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Yoga Slim 7i Pro (14", 5), Yoga Slim 7 Pro (14", 5) Hardware Maintenance Manual
to look up the Lenovo part numbers of the following