Step 2.
Install the built-in battery in reverse order.
CAUTION:
Before installing the built-in battery, thoroughly check the battery compartment and ensure there are
no foreign or sharp objects that could cause damage to the battery.
Ensure that the base cover assembly is secured in place. Otherwise, the battery connection might fail.
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ThinkPad T14 Gen 5/P14s Gen 5 AMD/T16 Gen 3 Linux User Guide