Re: HP 42S -- Battery Type and Constant Memory Message #4 Posted by Karl Schneider on 13 May 2005, 3:28 a.m., in response to message #1 by John Horak
John --
Luiz and John Limpert have given more details, but the simple answer is, three of any type 44, 76, or 357 cells. They are interchangeable, but it's best to use the same chemistry (alkaline or silver oxide). Silver oxide lasts longer but costs more.
HP-42S have a problem of not retaining the contents of memory during battery changes -- maybe a bad batch of capacitors was used, I don't know.
My older-design 42S from 1989 recently survived a battery change with memory contents intact. I also have a newer design 42S from 1992 whose batteries I haven't yet changed.
What experience do others have?
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