Hi there,
I always have to smile a bit reading what Google Translate is making out of it! Anyway, I understand your question in German and the translation is pretty okay, although somewhat strange.
Anyway, my battery symbol is also green (has always been green), and a lot of phones have that green symbol. Doesn't seem anything to be wrong with it, so I would'nt worry if I were you. Just let it be what it is.