Introduction
Prerequisite-only guide! This guide is part of another procedure and is not meant to be used alone.
Use this guide to safely disconnect the battery before beginning repairs on a Lenovo ThinkPad L390.
Tools
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            Use your fingernails or two opening tools to gently "walk" the battery connector directly out of its socket. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.