Re: HP-41C: +3V inner battery contact Message #2 Posted by Luiz C. Vieira (Brazil) on 18 Mar 2012, 10:25 p.m., in response to message #1 by AlbertTocarLoseggs
HI.
If you are mentioning the middle point between the four batteries, the contact is not used inside, it is just a bridge. The rechargeable battery pack does not have any points there, and the earlier HP41 calculators had a pair of contacts that allowed the calculator to be powered with external source. The schematics provided in one of the threads will give more info.
Cheers.
Luiz (Brazil)
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