Ran it last night with full NiMH batteries and got four files, three were 2+ gb, last one was less than 1gb, so it seems my batteries died before filling the card. But it appears that the Adata card worked fine.
It recorded 3:22 + 3:22 + 3:22 + 1:26 = 11 hours and 32 minutes of 16/44.1 audio on one charge, unattended! Pretty cool for a recorder that's about the size of a cell phone.