HP Forum Archive 09

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HP 15C Message #1 Posted by David Barnes on 18 Sept 2002, 9:15 a.m. I recently uncovered my HP15C after many years and many years of use getting my BSEE. Can someone tell me what type (voltage/size) batteries are used in the 15C??? I replaced with the ones I thought were correct, but no go.... -david

Re: HP 15C Message #2 Posted by Glen Kilpatrick on 18 Sept 2002, 10:52 a.m., in response to message #1 by David Barnes Fetched from another HP Forum thread --- http://www.hp.com/cgi-bin/cposupport/get_doc.pl?SNI=hp12cfinan20040&LC=mobile_computing&Tfile=bpia5189

Re: HP 15C Message #3 Posted by Tom Sherman on 18 Sept 2002, 12:14 p.m., in response to message #1 by David Barnes Same as used in HP-12C and many other recent HP calculators: silver oxide 1.55V Energizer #357 or alkaline #A76 (silver oxide lasts longer). Or see more complete list of equivalents under "Batteries and chargers" at the HP Museum.

Re: HP 15C Message #4 Posted by Randy Sloyer(US) on 18 Sept 2002, 5:25 p.m., in response to message #1 by David Barnes If you have the correct batteries installed in the proper direction, consider the unit may need a hard reset. Sometimes when the unit has has been at zero voltage for a time, they don't want to wake up. The Hp suggestion is to take a small short piece of wire and lifting the plastic flaps, short the battery stack out with the wire for just a brief instant. This drops the voltage to zero and allows it rise slower than if you shoved the cells in. Yes, it sounds crazy, but it works.

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