Casio DC-E700
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A accidentally found such thing: an old databank which is somewhat special:

* is has size of a credit card,
* it is almost as thick as a credit card (~1.5mm),
* it runs on solar cells ONLY (no battery),
* it uses an EEPROM to store data (~300 items).

Well, things are not so simple -  it needs electricity to be change the
EEPROM data. So there is a dock which incorporates a CR2015 battery and
which is slightly  bigger that a credit  card is. And the  keys are far
from comfortable. The solar cells energy is need just for searching and
reading of data.

It's  a cool gadget, though.