I haven't tried to detach the unit from the helmet. I just take helmet into the house to charge. I think the unit will stay charged for 8 hrs. but I don't know yet only used it for 2 hour's. I think the main complaint I have is not having the inside sun shade, I really liked that on the last one. Listening to music is good but answering the phone or making call while riding, I don't really need or want. The main reason I wanted this helmet is because my old helmet was white and people thought I was a cop. This helmet is black and matches my bike. LOL The Bluetooth is cool and easy to use but I haven't figured it all out yet.
Oh yea the Christmas trade was not that great, the wife bought me some other stuff and I didn't get her anything small. Felt kinda Small Christmas Eve.