Hi I have a Pretzl Headlamp but need a battery pack (E55) but reading the other comments on your webpage I was slightly confused, some answers to queries re the E55 say that it is no longer available whilst other replies say that it is available?, is this a availability determined by the country of the Headlamp user? I now realise, from comments on web page)that there is a battery adaptor (E13) which is available and allows the use of regular AA batteries, is this still the case at present? Many thanks for any assistance, regards, Steven