Re: HP 29c power requirements Message #8 Posted by Michael de Estrada on 7 Feb 2009, 10:38 a.m., in response to message #1 by Todd Rockwell
The power requirements of all 20 series (Woodstock) calculators are stated on the label on the back of the unit, located between the 2 bottom rubber feet, and are 2.5V, 500 mW. The source of the power does not matter, provided it is applied at the battery terminals inside the calculator, it is DC, and proper polarity is observed (the positive terminal is on the left side of the calculator, same side as OFF/ON switch). As stated by Randy, NEVER operate the calculator with the AC battery charger, unless a good NiCad battery is installed. This also applies to the 30 series (Spice) calculators.
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