About frist scientific calculator powered by solar cells and button cells

[Didier Lachieze]

(08-16-2017 10:17 AM)Alevin Wrote:  what was the frist scientific calculator powered by button cells?

In 1972 the Sinclair Executive was using button cells batteries (3 or 4 depending on the version).

(08-16-2017 10:17 AM)Alevin Wrote:  What was the frist scientific calculator powered by solar cells?

If you're looking for the first calculator powered by solar cells without any battery, it seems to be the TEAL Photon from 1977, but in 1976 the Sharp EL-8026 and the Royal Solar I / Triumph-Adler 1980 were using solar cells to recharge the internal batteries.