USb Charging & rechargable batteris HP41

[jebem]

(02-26-2024 09:31 AM)PeterP Wrote:  Thank you Jose, this is a lot of great info and answers much more than just my initial question, thank you!

Cheers

Peter

Thank you, Peter.

As Sylvain and Massimo have posted above, Diego has an excellent solution, tested and ready made.

I just found out (Thank you Google) that it was extensively covered at the HHC 2023 Convention, by Sylvain.
Here:
HHC 2023: 82120D Rechargeable Battery Pack for HP-41C (Sylvain Côté)