HP35 problem with a calculator, maybe due to a faulty charger

[Maximilian Hohmann]

Hello!

(03-21-2021 09:37 AM)ThomasF Wrote:  ... do you know the best way to charge battery packs outside the calculator?

Since many years I have been using a laboratory/desktop power supply for that purpose. You need one which lets you adjust voltage and current. Set the current at 1/10 of the battery capacity for NiCd batteries and anything between 1/10 and 1/3 for NiMH. This also benefits the longevity of the batteries compared to the unregulated charging of the original chargers.

Regards
Max