HP42c



#2

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.
Al


#3

Hi,

the right size is LR44 ;-)

Raymond

#4

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.


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