Hi James, TMS, My battery has just stopped charging. I have a Bose which has stopped charging. I came across a youtube video suggesting it could be that the battery has gone into "Battery Protection Mode" I followed the suggestions provided in the video but without results. Before the video ends the guy suggests a firmware up-date. Is it obvious what A, D, V, Up Arrow & Down Arrow in sequence means when up-dating? Don't suppose there's a youtube video showing this procedure is there?!