I have a question for anyone using the Cochlear n7 and disposable batteries: Do you find after 5-10 mins with disposable batteries the n7 shuts down, complaining "battery empty"? The first couple of years never had this problem but the last 6 months or so that is all it does. The processor has been replaced, battery holder replaced, all brands of batteries tried and it still does it. So annoying. On the other hand, the rechargeable batteries do not cause any problems. So weird.