Lenovo ThinkPad 10 Hardware Maintenance Manual page 54

Detach the built-in battery connector.
Note: Before removing any further FRU, ensure that the built-in battery connector is detached.
When installing: Ensure that the connectors are attached firmly.
For models that are not equipped with a smart card reader:
Removal steps of the back cover assembly
Release the hooks around the dock connector gently using your fingers.
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