The battery charge lasts for hours and he just pops them in the base when he goes to bed and theyre fully charges the next morning. I have bought three pairs of these. Werde es versuchen mit Dämpfungsmaterial nachzubessern. but they all do. The mike is quite heavy. I listened to The Beatles and found loads of hidden gems amidst the music, which I didnt even realize was there, despite listening previously over 100 times. I keep my USB 3. Every pair had the interior lining "wrinkle" under normal use which becomes very uncomfortable and unusable (see pics. 5 the size plus this 8. This slide is by far the best fitting, most comfortable, and probably the nicest looking I have ever owned.