Phil White wrote that his HP-65 card programmable calculator's batteries are kaput. I'm not sure what model that was, but if it's like my HP-25 programmable calc., you can keep it running on replacement non-HP batteries. Just cut open the HP battery-holder with a razor, pop out the original cells, and put in any good quality rechargable 1.5v AA cells. Then superglue the battery-holder back together. I did.
