The Museum of HP Calculators

HP Forum Archive 05

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Message #1 Posted by JMB on 19 Feb 2001, 4:51 p.m.

Objet: Re: HP41 Date: Mon, 19 Feb 2001 10:39:36 -0800 De: Dave Hicks <> A: Jean-Marc Baillard <>

At 05:52 PM 2/18/01 +0100, Jean-Marc Baillard wrote: >Dear Sir, >I would like to know if it is possible to use a 6V lithium battery >in a HP41 instead of the four 1.5V alkaline batteries. >I am still a fan of this calculator and I'd like to increase >the duration of the batteries ( and to reduce the price...) >when I use my HP41 with an Hepax module . >Awaiting your reply, sincerely yours. >JMBaillard.

I don't know, but that would be a good question for the HP forum.


Dave Hicks ( The Museum of HP Calculators

Re: HP41
Message #2 Posted by Steve (Australia) on 19 Feb 2001, 5:19 p.m.,
in response to message #1 by JMB

There was an article in one of the PPC Journals that discussed the battery life of the HP41 when using a card reader. The author thought that Lithium cells should give better performance.

This person found that 2 3V lithium batteries (around AA size?) could be squeezed into the battery compartment of the HP41.

The result was far longer battery life (measured in numbers of cards that could be read).

On the basis that it's been done before, and that I never saw any subsequent warnings, I would feel that there would be no problem in using a 6V Lithium battery.

As a precaution, I would measure the battery voltage, to ensure it did not exceed 6.8v (which is about the highest voltage you'd expect from 4 fresh alkaline cells).

The fact that Lithium cells can deliver a high current is not a problem, since NiCad cells can deliver even more :-)

The major issues are the form factor, the capacity, and the cost.

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