The Tandy EC-4020 is a programmable calculator with 10 digits precision and formula input logic. It has 95 functions, 44 keys, and an LCD (liquid crystal) display. The power source is 2xCR20323V cell. Note: Radio Shack, Casio fx-4000P
A sample of this calculator is held in the calculator.org collection.
Facts at a glance:
|Power Source||2xCR20323V cell|
If you have a Tandy EC-4020 that is no longer working, you can first try replacing the 2xCR20323V cell batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent.
We suggest the following current model as a replacement: