How much battery consumption does the RTL510 Radar affects the head unit (Edge 830) no other sensors connected to the head unit.
As a very rough guess, it might knock about 20% off the stated life. The battery hit on my 530 is less than it was on my 520 Plus.
I did a 9 hour ride over the weekend, and battery went from 100% to 44%. I was running the Varia Radar, following a course and had a speed sensor, HR and PM connected.