Re: hp31e /34c batteries Message #5 Posted by Andrés C. Rodríguez (Argentina) on 24 Mar 2002, 4:22 p.m., in response to message #4 by Edwin Morales
At least in my experience with a HP 25, alkalines are OK. I think that the circuitry allows for the not so large difference between a fully charged NiCD (perhaps 1.3V) and a regular alkaline (usually a little over 1.4 V).
The 1.5 V value comes from the old, zinc-carbon (non alkaline) batteries, and is used usually as a convention. A less than 10% tolerance seems almost logical.
While this makes sense to me as an Electronics Engineer, I can offer NO WARRANTY because I don't have any detailed data on the calculators circuitry and proprietary components HP used. This is just my personal opinion.
The alkalines may give you some 10 hours of service, while NiCd of the '80s offered about 2 hours, but a 500 charge-recharge cycles' life.
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