I don't feel like I'm the first to have thought of this...but wouldn't 18V Li-Po tool batteries make a great power source? I feel like the answer is: probably...if well managed. The thought experiment turned into a real experiment. I looked into down regulating an 18V source to 13.8v with a few methods. Ultimately I went with Drok Constant Current Constant Voltage Buck Converter. Test set up is: [/URL] T0 power the rig in HF mode (100w nominal) about 7.3 amps will be needed. The single battery is good for receive only. I estimate efficiency at about 75%. This single battery should provide about 2.5 hours of power as is. The first test confirmed this calculation. Adding a second battery should provide 4 hours with a 25% transmit duty cycle. Perhaps not the best solution in the world...but...these batteries do charge in under an hour! Now i just need to build a better test rig than what I have. The only issue that might arise is what happens with batteries that have different charges on them. I like that i can hotswap them in RX mode...but im not sure if the batteries will try to charge themselves...hmmmm.