Converting HP-25 to NiMH batteries, possible?

[Wes Loewer]

(07-20-2022 06:21 PM)Maximilian Hohmann Wrote:  Yes, it's something different. There are countless threads on this topic but it is always worth reminding fellow collectors and calculator users: The chargers of the "Woodstock" series calculators have a poorly stabilised output voltage. Connecting one to the calculator without a battery in place will almost instantly kill the calculator.

Yes, I was aware of the Woodstock problem with connecting the charger without the battery, but I didn't realize that this could happen with even a different battery in place.

Yep, better safe than sorry.