Re: Storing HP-42S without batteries Message #3 Posted by Randy on 19 Oct 2013, 11:17 a.m., in response to message #1 by Yriarte
IMO, all hp calculators should be stored with batteries removed as all batteries will leak when they fully discharge. The risk of leakage, by far, exceeds the very slight risk of capacitor failure due to lack of forming voltage.
Overall, the capacitor risk is incredible small and only applies to some of the models where there are high capacitance standard aluminum electrolyics. This would include later models of the 41, the 48 series and the models that followed them, time-wise.
Pioneers and Voyagers have a very low component counts so they are the most likely devices to survive long term storage. FWIW, Pioneers have no aluminum electrolytic caps, early Voyagers had one small value cap that was later was changed to tantalum - which do not dry out so they should be good for the long term.
Do not store in a bag to reduce the chance of condensation and provide stable temperature and humidity levels.
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