Resurrecting an old thread. How many of you still have your cooyoo's I am still wearing the copper one I bought in '15. every now and then I swap out for one of the two Ti's I bought at the same time. Have replaced one battery,so far. all the newer ones are bigger and of lesser quality. some have captive heads and have only a half to a full turn to turn on with very sloppy threads. Why when they make a descent product do they go backwards and make the next model cheaper?