I bought this 4/5 months ago. I don't think I've charged it more than 10 times. It has been used very little. The box is also available. I haven't even taken out the original cable yet. In a word, the sound quality is awesome. When talking, you have to speak a little louder - at least that's what I felt. There are no problems, Alhamdulillah.
It mostly stays lying in the office drawer. So I decided to sell it.
Whoever buys it, please check and inspect it thoroughly. No returns will be accepted after the sale.