The Calculator Store
LR44 battery for calculators of Voyager series (HP10c, HP11c, HP12c old, HP15c and HP16c) and Pioneer series (HP10b, HP17bII, HP42s, HP27s)
Not valid for the new HP12c with two batteries (with wide battery cover), HP Platinum o HP15C Limited Edition. These work with CR2032 batteries.
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