Mine wouldn't turn on straight out of the box with brand new batteries in it. I sent it back and they replaced whatever didn't work...the switch??
I have left it for months on end (Haven't used it regularly since December when i no longer had a job to commute too!!) and it hasn't drained the batteries in it so seems strange that others have had this problem. The batteries in it haven't been charged since December!
Oh...and that business of not shutting down to a low level is **** scary when tanking it down a pitch black country lane!!!!!!!!!