HP97 The journey begins

[Chr Yoko]

(04-29-2023 03:20 AM)teenix Wrote:  

(04-29-2023 02:41 AM)tangdfx Wrote:  Hello，tony

Is it possible to have an alternative choise to use normal AAA battery.

The new CPU board needs a minimum of around 3.6V to operate properly. There is no switched mode power supply like the original. The LiPo seems to produce about 3.8 - 4.2V which fits in with the low batt detect and it also fits in the case without stress.

cheers

Tony

Hi Tony, if you are using Li Ion batteries, please make sure they have their BMS included. A BMS is the battery management system circuit board that will protect the cell from under voltage, over voltage and over currents. It has also a temperature probe. This is important for safety.

In case you create a short in the calculator, you do not want it to burst into flames and white toxic smoke.?