Yep, it’s 2020 and even ultrabooks can hold a 45W processor and a dedicated graphics card.

1. Remove the bottom plate

This laptop requires 7 Torx-head screws to be removed in order to access its internals. After you undo them, pry the bottom panel with a plastic tool, starting from the back.

2. Battery

As of the battery, its capacity is 70Wh.
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https://laptopmedia.com/highlights/inside-lenovo-yoga-slim-7-15-disassembly-and-upgrade-options/