Adapting cell battery to HP 41

[Artur - Brasil]

(01-10-2020 02:15 PM)Craig Bladow Wrote:  

(02-26-2019 12:04 PM)Artur - Brasil Wrote:  I just have one doubt about my project: what will happen when battery discharge too much...
Best wishes!

Artur, did you find out what happens when the battery is discharged to a low voltage? From looking a lithium polymer battery pack specifications on line, if they have protection circuitry, they have a low voltage shut off.

Hi, Craig!

I really don't know. In my HP41 I don't let it get too low, or I'll loose my programs! Good Li-Ion batteries last much more than NiCd or NiMH.
But I believe the devices will just not work.
I saw on Ebay some small charge indicators, very nice, but here I couldn't find them.
Many thanks
Artur