After 5 days battery finaly died. Now I'm recharging. But I'm afraid. Rather not above 400mAh. I'm glad I have USB capacity meter. I don't want to wait next week for usable headphone for sure. I have time to next Friday to refund it. And it is what I will propably do. Lack of comunication, no detail what the problem is and no solution after all. I swear, no Corsair products anymore. I bought premium product and I expect flawless product. But this is the worst headphones I ever had. Not by sound quality but software (firmware). This is the worst experience what I had with accessories. And I mean it. And if I notify the trade inspection, they will withdraw your goods from the market. And I know you have interests in our country due the infulencers on youtube. And be awere that I'm not alone. This is your reputation. And I can go and buy competitive product of course. But it can't go without response from my side. Sorry but I can't. Other people need to be warned.