Hey Carsten. It sounds like it might be broken :/
Here is a [http://www.amazon.com/Internal-Battery-LG-2100mAh-Optimus/dp/B00DRODFNK/ref=sr_1_1?ie=UTF8&qid=1392648118&sr=8-1&keywords=nexus+4+battery|link to the battery] we always use and have had great success. Let me know if you have any further questions and I will gladly assist if possible.
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