^Yeah 5-10 years is a good plan. Strangely enough, tho, one of my SE's still has the original black Varta battery in it with the leads. Still keeps time.

Was that SE/30 or the logic board stored outside or in a garage/basement?

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The SE/30 was, from what I gather, stored in a very dry basement for a few years, but had been used by the Group Health Cooperative hospitals in the Seattle area previously. Battery was original, though, so ~23 years old.

-J