Re: Rechargable batts for a HP25C, but how? Message #2 Posted by Dave on 18 Sept 2003, 11:23 a.m., in response to message #1 by Matti Övermark
Replacing the cells is quite easy. Just make a cut in the end of the plastic strip that runs between the cells and remove the old cells. You can replace the cells with any NiCad, Alkaline, Li-ion, NiMH cell you want (AA size). There are occasional size variations that can make some cells work better than others, but all can be made to work. Make sure you get the polarity right- easy to check by noting polarity of cells removed, or info is available on this site. Of course alkaline batteries can not be recharged. It is not a good idea to recharge your batteries in these calculators due to potential damage to circuitry. Of course the original charger circuit was not designed for Li-ion or NiMH, but this is not an issue if you do not recharge them in the calc, and I am not sure if it is an issue in any case. Again - please do not recharge in the unit as poor contact with the battery can destroy the calc circuits....
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