Introduction
How to replace the battery of a HP EliteBook 755 G5 laptop. The images and information in this guide were taken from this computer's service manual.
Tools
Parts
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            Turn off the computer. If you are unsure whether the computer is in Hibernation, turn the computer on, and then shut it down through the operating system. 
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            Disconnect the power from the computer by unplugging the power cord from the computer. 
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            Disconnect all external devices from the computer. 
 
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            Turn the computer upside down on a flat surface. 
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            Loosen the eight captive screws that secure the bottom cover. 
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            Loosen the two inset captive screws that secure the bottom cover. 
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            Starting under the middle of the display, pry and lift the bottom cover off the computer. 
 
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To replace the battery & reassemble your device, follow these instructions in reverse order.