Einleitung
If your device is not holding a charge, or only functions when plugged into the charger, then this guide will show how to fix this problem by replacing the battery. This process could take anywhere from 15-30 minutes, and requires you to detach and desolder all of the battery's connection to the device.
Werkzeuge
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Insert the hooked end of the plastic opening tool in the gap between the screen and the back panel on the edge of the device.
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Slide the plastic opening tool down the long side of the device.
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Insert tool again and slide it down the long slide of the case a second time.
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Flip up the black retaining tab using the plastic opening tool.
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Pull out the large wire ribbon that crosses over the battery.
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Insert the plastic opening tool under the battery.
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Using the plastic opening tool, pry up the battery.
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Remove the wires from the motherboard using a soldering iron tool. Here is a link on How To Solder and Desolder Connections.
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After the connections are desoldered, remove the battery.
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To reassemble your device, follow these instructions in reverse order.