Re: Nominal vs. actual V in dc cells Message #9 Posted by OJM on 4 Oct 2004, 5:10 p.m., in response to message #8 by Chan Tran
I took a look in the technical data section of the Energizer web site:
http://data.energizer.com/batteryinfo/application_manuals/silver_oxide.htm
This page indicates that the initial open circuit voltage of a silver oxide cell is 1.6 volts. Since the HP Voyager calculators impose such an extremely low current drain, the voltage when newly installed in the calculator must be nearly the same as the open circuit voltage. This would mean that the calculator would receive 4.8 volts from a new set of silver oxide cells. On another post on this forum I mentioned my experience with a friend's HP15C which refuses to operate on silver oxide cells. It runs perfectly on alkaline button cells, but just does not turn on when silver cells are inserted (this is after checking for the usual things such as poor electrical contact, cleaning off finger oil on batteries, trying another set of silver cells, etc.). Is it possible that 4.8 volts versus 4.5 volts could cause this behavior?
For the record, my own HP15C doesn't seem to care, and runs just fine on both alkaline and silver oxide cells.
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