>>1613028I am in VK6. The battery is a 4 cell LiFePO4 pack that I made up with a charge controller and Anderson connectors in a jiffy box, added a USB/voltmeter to the set up. It charges up to about 14.5v and runs at about 13v. Capacity is 15aH. Does the job nicely. I was talking on 80m in the evening for a couple of hours and the voltage didn't flinch.