Poorly engineered. It's a non-removable lithium rechargeable battery, for goodness sakes. Did you EVER get more than five yeas out of one? And no one mentions this? Sorry, but for $60 I am NOT going to throw away a pair of headphones after five years, at best. I am so sick of merchandise coming from overseas designed to take a quick bite out of my wallet and then crash. Vote with your wallets AND your minds.