I installed my halos to operate as brake/blinkers by wiring them into the 7pin harness. I also used this 7pin to wire the main white LED as reverse lights only. Easy to do, without the mess of the 3rd party harness.
These are the same ones.
https://www.ebay.com/itm/285482714100?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=hkp4q0q8SjK&sssrc=4429486&ssuid=2h1AcJaZSie&var=&widget_ver=artemis&media=COPY
The 12v battery is maintained by the Hybrid battery. The hybrid battery is charging anytime the ICE is running, except on acceleration or low speed EV travel. The battery can charge while in park, it doesn’t need to be moving or braking to charge.