Some of my EBS pedals don't work with batteries anyway, it's something about the external 9V jack that stops working properly, doesn't switch back to battery power when you un-plug it, and needs replacing. That could maybe be one sneaky reason for a seller to say a pedal doesn't take a battery? I don't know about the earliest versions of EBS pedals though, maybe they did indeed not take a battery.
I think you should send an email to EBS at http://www.ebssweden.com/2009/contact.htm
, they are very helpful in my experience.