Plus you can get a free wireless charger within 14 days if you register and send in your mailing information. As for the battery acid odor, I cant really think of the cause of this. But, as expected, with many days of on & off they do tear. -Comfort is excellent, you get ear hooks with the headphones so its great for working out. Und sehr analytisch in den Höhen, anstrengend), Creative Sound BlasterX H5 Tournament Edition (Räumlicher Klang als hätte man einen Pappkarton über dem Kopf), Sennheiser GAME ZERO Gaming-Headset (Viel zu "kopflastig". I don’t like ear bud headphones because they don’t stay put, but I don’t want anything heavy on my ears, especially if I’m working out. Ive had them come off from even slight contact when not in my ears, and the tips occasionally get left in my ear when I take the headphones off. The midrange is slight subdued, but not to a level most listeners will find objectionable, as again it is rich and warm in presentation, likewise not lacking in detail. I highly recommend this marinade. Maybe it is wood!