I'm starting to build my Arducopter and immediately after having gone through the tests I could do with Mission Planner and a USB only I started looking for a solution on how to avoid recharging LiPo batteries every 10 minutes of testing, a especially how to avoid spending money on replacing AA stilo batteries just for testing the radio.
So I came with the idea of using my bench power supply for powering both the Arducopter and the radio. I basically created 2 power cables, one that goes into the battery socket and one that goes into the radio power plug: on one side the respective plugs and sockets (a JST connector for the radio and a XT60 connector for the battery) and on the other side two banana plugs that go into the power supply.
I doubt I'm the first using this approach for testing, but I don't recall seeing it anywhere, so I thought it was worth posting it.
Here more pictures of the setup.
A closeup of the TX power cable
A close up of the other cable, plugged into the battery socket