Re: HP-38C + NiMH Batteries: Bad Idea? Message #4 Posted by Andrés C. Rodríguez (Argentina) on 29 Apr 2002, 8:22 a.m., in response to message #3 by Richard W. Smith
If possible, it is VERY MUCH advisable to charge the NiMH outside your HP38, with an external (NiMH specific) charger.
The recharge cycle for NiMH is different than for NiCd, and you will also avoid the risk of "frying" some internal parts of your calculator if anything goes wrong with the internal charging circuit. A simple dirty contact or momentary misconnection will allow more than 8 volts inside tha calculator, and the chips will be damaged irreversibly.
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