Long term battery concern

[Carsen]

If I can't use my calculator 31 years from now, then what is the point of collecting them? To me, I need them to function in order for me to want to collect them. Plus if I cannot get my HP Prime to last 31 years, it shows that the quality and design of these new calculators are not meant to last, which if that is the case, I want the older HP calculators back.