Presentation and question about calculators long term storage at low temperature

[Alevin]

(05-11-2017 08:01 PM)Vtile Wrote:  I'm talking out of my league, but also long powerless periods will temporarily degrade atleast electrolytic capacitors. One of the corners of electronics which is constantly dealing with these are atleast antique radio collectors and I would assume the "volt nuts" that is the metrology equipment collectors and professionals.

Therefore, for calculators that are stored, a good procedure will be to periodically insert batteries or plug in AC adaptors and keep the stuff powered for a while?
Any suggestion of periodicity (once a month? Once a year?...) and switch on time (minutes, hours,…)?