AestilI believe all of the editions can technically be battery powered, but I don't think the ones offered in this drop are meant for portable use. They don't come with batteries and may not even have the battery terminals intact if that's what "Power Battery (not included)" means. If you want to install batteries for portable use, you can order an O2 from JDS Labs. https://www.jdslabs.com/products/35/objective2-headphone-amplifier/
eksuenyeah, that is what I am trying to figure out. Its a lot less expensive to order off Massdrop for this item, and my main use would be portable. So, looks like I have to skip this drop?
Aestilyou can choose either battery supply or main supply from ac adaptor , all you have to do is buy a pair of batteries , i think its the square 9v rechargeable .
i might be wrong but i think both edition might have the battery option .