Hi all,
a final update. It was really a hardwre issue with the battery. I replaced it with a Mars battery and it works perfectly well. The Mars battery is significant smaller in size, but but still be glued into the Ares and works nearly like the originl one (one 100mAh less capacity).
I also got a Mars replacement battery from AliExpress with 4100mAh. But haven't used it because the cable colors were completly different and I didn't wanted to risk to damage the other hardwaare.
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