Calculator collection : How to power calcs without constantly opening?

[Archilog]

Good evening,

It was probably said before, but I avoid your (smart?) solution by using a calculator for a while (two weeks - two months or more) with good rechargeable accus and then after, remove the batteries. Exceptions are my HP-29E, a PSION 7 and a PSION 3mx, permanently used.

It is clear that I am therefore not using my HP-37, 38s, 21, 22, 25s, 41s, 18, 28s (and so on) very much, which should need an inspection usually every year at least, but I am also not so disciplinate... For the best and for the worst.

Take care ;)