Einleitung
Few tools are required to do this.
A small plastic pry tool or even a fingernail is sufficient. Working area surface should be clean and dry with adequate lighting.
Immediately wash hands after handling the battery and completing the process. Discard the dead battery properly.
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Use your fingers to pinch the battery at the grey semi-circles on the edges of the battery and remove it from the device.
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Abschluss
Set aside the old battery, then replace it with the new battery. It should easily fit into place. Then, you can replace the backing of phone, pressing gently to secure it down.
Pry off the back and separate it from the front of the phone case. You should see the battery once you pry the back off.
(rewriting the second sentence)
You will see the battery once the cover is removed.
Aubrey -