[Elecraft] KX3 Internal Batteries

[Don Wilhelm]

Scott,

The KX2 will not produce its full 12 watt output with the internal 
battery pack - expect a maximum of 10 watts, but if battery life is a 
consideration, use 5 watts output.

You can always use an external power supply or battery pack of up to 15 
volts to provide full 12 watts output.

I would not recommend any method of charging Li-Ion batteries in the KX2 
or any other radio.  Remember the reports of "flaming" cell phones!

73,
Don W3FPR

On 12/17/2018 9:41 PM, K9MA wrote:
> I don't own a KX3, but it appears the internal batteries are a 
> limitation. By contrast, the KX2, which I do own, uses an 11 V internal 
> Li-Ion (Li-FePO, I believe) battery, and is designed to provide full 
> output at that voltage. (The KX3 requires at least 12 V.) One 
> possibility for the KX3 would be to do as I did for my old KX1, which 
> was to replace the internal batteries with four AA Li-Ion cells, plus a 
> low dropout linear regulator to limit the voltage to 15 V. The batteries 
> would have to be removed to be recharged, and a second set would be 
> required for longer operation.