Introduction
This guide will help you replace the battery of a Dell Chromebook 11-3120. Please have a safe, static-free place where you can place the battery after it has been removed from the device.
Tools
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Flip the device over so the bottom is facing up
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Remove the 7 visible Philips screws from the device's bottom cover
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Insert a thin prying tool into the front (facing the user) corner between the rubber bumper and the plastic case to pop several latches.
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Starting from the partially-opened corner, pull the case away from the device in a hinging motion. I rotated the computer so that the opened corner faced me in the image.
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Conclusion
To reassemble your device, follow these instructions in reverse order.