Hi!
Quick update,?I hot glued a battery holder to my case and I'm getting around 12.6 volts (fully charged) with three 18650 LiOn batteries. I believe these are rated 3000mah (Samsung ICR18650-30B). ?The output power is 2 point something almost 3 watts according to the meter on my MFJ tuner. The battery holder came from our friends at eBay and the LiOns from a Dell Laptop battery.
Also added a power switch in the back. This thing is sweet !?
73s
Norbert