Doesn't the ATN have an option for an external battery pack? I have done this in the past and it works well. I am not an ATN fan though, you will be happy with the Halo.I have a ATN and don't really like it. The ATN goes threw batteries like no other. I have money down on a Halo LR 50. But may change to the newer rechargeable unit. But units are backordered waiting on a micro chip or something.