I'm on my 1st Dash Cam and it uses a Capacitor.
It's just one less devise I have to change batteries on.
But, what is also important is getting a quality Dash Cam.
Don't go low price.
I think spending $100 - $150 would get you a decent camera.
One thing I noticed when buying mine was that it's NOT like buying a regular camera.
There ALL made by overseas manufacturers, China, South Korea and ?
There is no Kodak, Cannon etc.
I'd never want to be without one.
Get one and you'll sleep better.