LOW BATTERY! AGAIN! anyone here use RPN calcs?

Wow I burn through batteries on this HP 50G calc.

I wish HP made a desktop RPN calculator.

Shit this is what I need. I need to find someone selling one.

 

I have an HP15C that I bought new.. it's on it's second battery.. I use it a little every day for what, 20 years or so...

 

Damnnn that's snazzy. I still use one of these. Not RPN tho. And sometimes the crank breaks...