Urgent request from all of our clients who bought a Gaurdian Epipe 2 from us. Please could you let us know what batteries you are using please. Are they the flat top or are they the button top. Why we ask is we have had a problem with one pipe and now the replacement head we got which was working has failed as well and it was working fine. Just trying to eliminate future problems and rectify this problem. SO PLEASE LET US KNOW IF THE BATTERIES ARE FLAT TOP OR BUTTON TOP Thanking you in advance.