Why are the HP Prime and HP-35s so unpopular?

[aurelio]

(01-24-2021 12:46 PM)Maximilian Hohmann Wrote:  Hello!
Just like one refuels one's car before setting off for a long trip early in the morning or late at night. Also, because my first calculators were rechargeable, the idea of powering a calculator (or any other battery hungry device) from disposable batteries just disgusts me to a point of not using that device. I am very much with Greta on these issues.
Regards
Max

Unpossible to disagreee with you, Max
In the 80's casio sold a lot of calculator with photovoltaic cells, I have still one of that I've used daily on the field (not RPN, sigh, not scientific...) together with the 25c and the 41, why HP never tried to introduce those devices in the best calculators, just a matter of efficiency at that time of the photovoltaic cells, why at least as a backup source?

(edit for typos)