A question about alternative power supply for hp41 series

[Artur - Brasil]

Dave, what a great job with 3d printers!
Why not new HP41 back cases? Just wondering ....

Well, I believe that using new standard batteries - like AA or, even better and small, cell phones, and a converter to 6V would be a better solution, as N-cells on some places are difficult to find; using a USB or wall power supply will hook you near it - no mobility - an hp41 is a portable calculator, not a desktop calculator ...
With your battery cover already modeled for shapeways, I believe it would be simple to remove the inner battery separators and model a new one that could hold in one AA, or two AAA in parallel, or a cell phone battery, and the converter to 6V, as the one bellow:

http://www.ebay.com/itm/DC-DC-0-8V-6V-to...781?_ul=BR

or

http://www.aliexpress.com/item/1Pcs-High...71671.html (just asking for a 6V output instead of 5V)

The 1.5 cell get weak, just throw it and go to the pharmacy and buy another...