HP 33E Question - battery and NiCad batteries

[Eddie W. Shore]

(08-13-2021 12:44 AM)Steve Simpkin Wrote:  

(08-13-2021 12:25 AM)Eddie W. Shore Wrote:  I just ordered a new NiCad rechargeable battery for the 33E. When I plugged in the rechargeable battery and I used the AC adapter, the display goes haywire (cycles between all 8s, 1s, random symbol) for a few seconds before it blanks out.

Does that mean that the AC adapter is damaged or my battery needs to be charged?

Thanks.

Eddie

Try charging the batteries with an external battery charger. That will verify the batteries are fully charged (assuming the new batteries are good) and eliminate any potential issue with the HP charger. I wouldn't recommend charging the batteries in the calculator anyway as it's just too risky.

Any recommendations for battery chargers?