Introduction
This guide is on how to replace your Chromebook CB315-4H-P8FZ's battery. You may need to do this for a multitude of reasons including, but not limited to failure to charge, unexpected shutdowns, swelling or bulging battery, etc.
Although made specifically for the CB315-4H-P8FZ, this guide may help with other models of Chromebooks and laptops.
Tools
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Remove the ten 6 mm Phillips screws that secure the lower case.
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Insert an opening pick in the seam between the lower case and chassis.
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Slide the opening pick around the perimeter of the device, prying every couple of centimeters, until the lower case fully releases.
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Remove the lower case.
 
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Carefully life up the clear tape, then the black tape covering the battery connector.
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Use your fingernails to gently "walk" the battery connector out of its motherboard socket.
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Lift the battery up and out of the chassis.
 
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To reassemble your device, follow the above steps in reverse order. 
For optimal performance, after completing this guide, calibrate your newly installed battery. 
Take your e-waste to an R2 or e-Stewards certified recycler. 
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.