Using parking guard do of course put additional strain on a battery that would otherwise just sit there and wait for the next drive, but dashcams dont use that much power, and there will be a discharge prevention protection in the hard wire kit so the camera can not discharge your battery so deep it cant start or will be damaged ( car batteries are not meant to be discharged too deep )
But with a sensible low cut voltage selected, then its not like dashcam parking guard use will cut your car battery life in half, but it will have a shorter life due to it also do more than a car battery normally do.
There should be no user interaction needed once hardwire kit have been installed and the function turned on in the camera.
Personally i would just use parking guard out and about, at home i have CCTV on my car where it is parked, so going about it this way do mean i will have to do some user interaction.
If you live in a house and park in your garage or driveway there are little chance of a event there aside for the most dedicated vandal, but out shopping and maybe where you park when working it might be a good idea to have parking guard on.
And also one have to be aware that if you park a lot and drive a little, then you can get to a place where your car can not charge as much juice on the battery than get depleted when parking a long time.
But most cars have a fairly high charge rate so you have to park a lot and drive a little for this to be a issue i recon, if you drive a couple of hours every day to and from work and whatever you should be good.
I assume the hardwire kit will be a 3 wire one, one + wire connected to a always on circuit ( parking ) - another + wire connected to a ACC circuit only on when driving ( driving ) and then a common - wire to be shared.
