[time-nuts] HP-105B Battery Replacement?

David G. McGaw david.g.mcgaw at dartmouth.edu
Fri Sep 16 17:01:09 EDT 2016

It has been my experience that both chemistries have thermal cutouts for 
overcharge limiting and both can use chargers that detect the negative 
voltage slope when the cells heat up once they are fully charged, hence 
the ability to use the same chargers for NiCd and NiMH.  I have many 
radios that started out with NiCd batteries and the newer replacements 
are NiMH.


On 9/16/16 2:37 PM, Brooke Clarke wrote:
> Hi David:
> The chemistries are very different. Ni-Cad is endothermic whereas 
> Ni-MH is Exothermic.  This is why chargers for Ni-MH have a mandatory 
> temperature sensor.  This is one of the reasons I say Ni-Cad cells 
> batteries are easy to charge.

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