3d model of FP1 battery

This could be the already used battery HB5N1 for Huawei:

It is just incompatible with regard to the protective circuits, as e.g. the temperature is not given correctly.
You will find near the end of the thread, that there already is one online-shop offering the battery modified in a way, that it fits and another shop stating to work on an adapter, that will be available no sooner than by march.