I have a Norelco 805 RX shaver from about 12 years ago. Two years ago it just died. I can't find any easy way to open it in order to removie/change the battery. Are these things supposed to be disposable after they die out? For over a hundred bucks, that wouldn't please me. I've grown a mustache and beard since in order not to have to shell out for another expensive shaver - I use a cheapo trimmer now.