What is the recommended battery replacement process for HP ZBook 15 G3?
To replace the battery, first turn off your computer and unplug it. Remove the bottom cover by loosening nine captive Torx screws and lifting it off. Disconnect the battery cable from the system board; then unscrew three Phillips screws securing the battery and carefully remove it.
From the official HP Zbook 15 G3 Mobile Workstation manual, page 34
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