I built this primarily to power repeaters which we sometimes have to hike up on top of a hill to place. Sure beats carrying a heavier battery. I bought a couple adapters for Milwaukee batteries off Amazon for $13. I rigged up both in parallel and stuck two big 12 amp M18 batteries in them. This is probably overkill as we have had it powering a repeater set to 35 watts for about ten hours and the batteries only dropped one bar. I plan on trying it to power the base as well. These batteries put out around 20 volts when fully charged. The spec sheet on our R10's say they are good to 24 volts and the TDL450H can handle 30 volts so there shouldn't be any problems.
Nice. You really got 10 hours and 35 watts? Even if you only got half that it would be nice.
I did. I was surprised as well. I originally put the two batteries because I wasn't sure how long it would last. I am using CMRx which seemed to make a huge difference in battery life when we switched to it years ago.
I am not sure how the radio handles the higher voltage but watts are volts times amps so 35 watts at 12 volts is nearly 3 amps but 35 watts at 20 volts is only 1.75 amps. I need to test it but I really think it would run two full days.