[Elecraft] KX1 battery

[gehringc at charter.net]

I for one would at least like to hear if someone see any remote problem with this type of mod?

KI4DGH
Chuck
> 
> From: "Dick Harms PA2DW" <eqtc at xs4all.nl>
> Date: 2005/04/22 Fri PM 01:49:12 CDT
> To: "'Elecraft Reflector'" <elecraft at mailman.qth.net>
> Subject: [Elecraft] KX1 battery
> 
> Hi all,
> 
> Some days ago I posted a message regarding the charging of NiMh battery's. I
> got only one reaction, so I guess many are wondering what is a good way! I
> decided to go for the experimental way and did the following:
> - Measure the supply voltage, we call that U1;
> - Measure the battery voltage in charged situation, we call that U2;
> - Take U1-U2 and devide that over the charging current you want to use. In
> case of my 2400 mA/h cells I decided for a "conservative" 200 mA;
> - The result is the resistor value, in my case about 33 Ohm;
> - Take the square of U1-U2 and devide over R and you have the power, in my
> case  between one and 2W.
> I had a 33 Ohm resistor of 5W in stock which was only 0,3 inch, so it fits
> very nicely. I have mounted it on the component side of the pcb, otherwise
> it gets in the way of the battery!
> 
> The result is very positive, it charges nicely. I have mounted a timer in
> line with the charging supply, an old Nokia 12V GSM supply, to avoid
> overcharging as I read that NiMh cells dont like that.
> 
> Have fun! Oh and by the way; modifying is at your own risk and will probably
> violate the warranty. Or perhaps Wayne and Eric find it such a good idea
> that they will allow it ;)
> 
> 73, Dick PA2DW
> 
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