Another vote for 3 x 18650 cells. They're perfect for the job. I must admit to being a bit less cautious than the others regarding final charge voltage. When the cells are straight out of the charger, the pack sits at about 12.6V. The radio is safe to power up at that voltage in RX. After a few blasts of the QMX in SWR tuning mode, the voltage soon drops a little and is safe to operate. You can buy small plastic cases for 3 x 18650 cells from Scamazon or AliExpress etc. to which you can fit your connector of choice. I use XT-60 connectors on everything.
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I also have a couple of 3000mAh Lipo packs which work well with the radio. They're cheap and reliable but are a bit easier to damage than the 18650's.?
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