I just bought a 8-cell AA battery holder for Standard models C228A, C528A, C628A, HX190, HX240 and possibly others that used Standards RBP-120, CNB-152 or CNB242 batteries.  Unfortunately, I have an odd-ball HT that uses a different size case.  You can see the item here, mid-page - the CPB888:

If you can use it, let me know - first come, first in - I'd take a $20 for it via Paypal or whatever, and ship it to you for free (no - the battery cells are not included).  They don't have a like model for my unit and it's not worth sending back.

-W9RM