Adapting cell battery to HP 41

[burkhard]

(02-27-2019 03:48 AM)Craig Bladow Wrote:  A very creative solution! I believe the card reader is the largest typical load a 41c will see.

Now if there were a 3d printed battery pack to hold these components and spring loaded battery contacts.....

I agree. Nice work here! I like that the solution doesn't require hacking up the calculator itself and is completely drop-in/drop-out reversible. Hopefully that cell phone battery is a fairly common one that will not become unobtanium in 5 years.

Good job!