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brunnegd Student
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low bat warning

hp50g

I replaced the AAA and coin batteries, low bat(s) wrning still visible

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Distinguished Professor
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low bat warning

You needed reset the calculator, with ... ON+F1+F6 or with the point of one paper clip, in the Reset orifice, site in rear case.

For determine the battery charger, you can install the BtMon 1.0, from ... https://www.hpcalc.org/details/6587 

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