Newsgroups: sci.electronics Path: utzoo!henry From: henry@utzoo.uucp (Henry Spencer) Subject: Re: Long-Life battery and clock Message-ID: <1988Dec10.234303.26780@utzoo.uucp> Organization: U of Toronto Zoology References: <1310017@hpcilzb.HP.COM> Date: Sat, 10 Dec 88 23:43:03 GMT In article <1310017@hpcilzb.HP.COM> doug@hpcilzb.HP.COM (Doug Hendricks) writes: >1. A battery that can be trusted after 100 years of storage, 100 years of *storage*, or 100 years of low-level *use*? If it's not required to produce current during those 100 years, almost any of the schemes which separate solid and liquid components until activation would do. For example, an ordinary lead-acid battery with the acid stored in a glass container until activation time. Actually providing current for 100 years would be much trickier; better would be to have a set of good separate-component batteries activated in succession, so an individual battery isn't required to be active that long. >2. A clock of some sort to alarm after 100 years. This should not be hard if you can supply power. I'd guess that high- reliability digital electronics should last that long, especially if you make it triple-redundant against minor failures. -- SunOSish, adj: requiring | Henry Spencer at U of Toronto Zoology 32-bit bug numbers. | uunet!attcan!utzoo!henry henry@zoo.toronto.edu