Bought one of these 12V power tool battery adapters.
It has an adjustable output voltage - handy for the QRP-Labs QMX which is rather sensitive to voltage. Noise on receive seems very low. The one I bought is for Makita 18V batteries and was AU$35 on Amazon. I can see versions for other batteries. Also available from AliExpress but the price difference isn't worth the wait.
It came with a cigarette lighter socket but obviously I've changed it to Anderson Powerpole.

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