Re: KX1 - 1.6 volt NiZN AA Batteries
Posted by
Don Wilhelm-4 on
Oct 04, 2011; 2:06am
URL: http://elecraft.85.s1.nabble.com/KX1-1-6-volt-NiZN-AA-Batteries-tp6857052p6857328.html
Mark,
The discussion is about the KX1, and not a battery powered K2 or K3.
You want higher terminal voltage cells in the KX1 internal battery pack
because there is space for only 6 batteries. 6 times 1.25 volts is only
7.5 volts while 6 times 1.65 volts is 9.9 volts - a significant difference.
That is why the higher voltage Lithium (non-rechargable) batteries work
so well in the KX1.
Yes, if using an external battery pack, 10 NiMH batteries is desirable,
11 would be usable too.
73,
Don W3FPR
On 10/3/2011 9:43 PM, Mark Kachel wrote:
> A look at wikipedia says the volumetric energy density of NiZn batteries is lower than NiMH batteries. This was confirmed at a web site for strobe users. They are more like NiCd batteries in this respect. You MUST use a specifically designed charger. No using what ever is available.
>
> Wikipedia says NiZn batteries have an open circuit voltage of 1.8 volts and a nominal voltage of 1.65 volts. The numbers for NiMH batteries are nominal, 1.4-1.45 volts and ten percent discharge to 80 percent discharge of 1.25 volts.
>
> My question is, how many NiMH batteries can you put in series before you get in trouble running a K3 or such. It looks like ten NiMH in series is going to be OK. Do you design with the nominal, no load voltage in mind? How many NiZn batteries could you put in series and not worry?
>
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