Some customers have asked for a solution for the Classic battery. What has been suggested is something similar to the Woodstock battery holder: a 3D piece that can handle 3 normal batteries (still to be decided if we can fit AA or it'll have to be AAA) and that integrates the contacts with the calculator. All in the HP original black and with the usual HP classic fixings.
Anyone interested? Just to know whether to devote design time to it or not!