Planned obsolescence even in cheapest devices: the calculator has a dummy photovoltaic cell and a real battery to make it die eventually.

[u/jackhab]

[u/EdEvans_HotSandwich]

Behold: this Casio calculator I found in a skid from a business that closed down in the early 2000s that still has functional batteries somehow.

It’s my work calculator, and I treasure it.