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Powering a HP 67 without battery pack?
05-27-2019, 08:03 PM (This post was last modified: 05-28-2019 01:45 PM by rprosperi.)
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RE: Powering a HP 67 without battery pack?
Q1 - I will let more knowledgeable folks reply on this one.

Q2 - [Corrected] As Tony pointed out below, and actually seen in the photo, that machine in the linked article is a 35. And though on 35/45 the tabs come up from the right, they are still in the same relative position, so the battery sits in the same orientation, with (-) terminal on top and (+) on bottom, so even though tabs are different, the polarity is the same. Sorry for earlier comment and thx to Tony for correction.

Q3 - No idea why that would not work; the battery pack used 3 NiCD cells, nominally 1.2V ea. (but often a bit higher when fully charged of course), so 3.6V certainly should work.

Q4 - Yes USB can be used, there is a special cable available which does just that, but note that this cable connects to the CHARGING pin, not the operation pin (see the connector pinout in that same link). I can't say if direct connection to the battery tabs is safe, but I would not attempt it until someone here absolutely and clearly confirms so, the risk of damage is not worth it.

--Bob Prosperi
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RE: Powering a HP 67 without battery pack? - rprosperi - 05-27-2019 08:03 PM



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