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HP42c - Printable Version

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HP42c - Al Wilson - 01-03-2005

What kind of battery do I need for an HP42c?
I bought the same number that I found in it (LR43) and the new version was too small. (though it seems to operate when the batteries make contact with th terminals)
If you can help, thanks.

Re: HP42S - Raymond Del Tondo - 01-03-2005


the right size is LR44 ;-)


Re: HP42s - Richard Garner - 01-03-2005

In alkaline use LR44 but for long life using the Silver Oxide 357 is best. Silver Oxide batteries are a little more expensive than alkaline, about $9 for 3, but depending on use the Silver Oxide can last a couple of years to the alkaline couple of months.