[Elecraft] KX3 Suggested External Battery

[Bill Frantz]

Almost any power supply capable of 9 to 15 volts at 2-4 amps. 
Any family of batteries in that range will work. I use AGM lead 
acid batteries for field day. I have a lithium family battery 
for backpacking.

To calculate how much capacity (amp-hours) you need, measure the 
current draw on receive and transmit. Then figure out what your 
transmit/receive duty cycle will be and the time you will be 
operating to calculate the number of amp-hours you will need. 
Then double that because batteries don't like to be drained dead 
and you need a margin of safety.

73 Bill AE6JV

On 4/25/16 at 4:57 PM, elecraft at mailman.qth.net (TFJM via 
Elecraft) wrote:

>I'm sure this question has been asked many times. I recently bought a KX3 so
>I'm new at QRP and I'm about to head to a camp ground in a few weeks and go
>portable. Besides using internal batteries, what longer lasting external
>batteries are recommended? I hear of Lipo batteries and a slew of others.
>I'm just trying to navigate though the maze of options.
>
>Any and all feedback would be welcome.

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