Been using both the powered trunk and frunk kit (from Hansshow) for over 3 years now. Both are directly connected to/powered by the vehicle’s 12v battery. Zero issues so far and no observable/noticeable drain on the battery. My original 12V battery is still running strong… knock on wood…
So when installed correctly, none of the aftermarket kits out there should have any noticeable/significant drain on the battery.