Introduction
The Sony Xperia M4 Aqua has an internal battery, meaning replacement requires phone disassembly.
What you need
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Place the phone face-down, and use a heat gun or hair dryer to evenly heat the back surface until to soften the adhesive.
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Attach a suction cup to the back of the M4 Aqua by carefully pushing down on it near the top of the phone.
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While Pulling on the suction cup, slide a thin plastic spacer (guitar picks work well) between the back cover and the phone. Slide it around the edges to break the adhesive seal. Be careful, but don't be afraid to use some force. You should hear a sticky breaking sound.
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Remove the back cover by pulling it from the chassis. it is flexible and can be bent, be careful.
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Unhook the battery connector carefully. It is possible to damage the battery if too much force is used.
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