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The HP15C runs on three 1.5 volt button cell alkaline batteries.

The batteries for the 10C series calculators have several different names: A76, LR44, SR44, and 357 are some of the more common designations. These batteries are not too difficult to find today, they are still used in lots of small electronics like digital calipers. They can easily be found for less than $1.00 USD. They will run the 15C for over a year, many have gone more than 10 years on the same set of batteries.

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