Thanks for the replies, guys. I was thinking of buying that portable charging pack Sony released that apparently fills the battery at least twice; was just wondering what the implications would be (if any) from playing it plugged in!
By the way... I'm pretty sure NISA published Persona 4 Golden in Europe, not Atlus. I don't think Atlus have a European publishing arm.
Regardless, JRPG's and niche games in general don't really seem to sell over here. There's a medium-sized market for them in the USA (as evidence with P4G; Ragnarok; Soul Sacrifice) but it's just non-existent here. It's a shame, really. Although as long as my Vita is region-free, it's no problem to me.