Dell Inspiron 15 (5543, Early 2015) - Manual (Page 17)

Replacing the Battery
WARNING: Before working inside your computer, read the safety
information that shipped with your computer and follow the steps in
Before Working Inside Your Computer . After working inside your
computer, follow the instructions in After Working Inside Your
Computer . For more safety best practices, see the Regulatory
Compliance home page at dell.com/regulatory_compliance.
Procedure
1 Align the screw holes the battery with the screw holes on the base frame
and press-down the battery to connect it to the battery connector.
2 Replace the screws that secure the battery to the base frame.
Post-requisites
Replace the base cover .
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