I’ve never needed one but then again i am a better driver than most
That’s what you sound like highpeakrider,
as per the op’s question : I have a garmin 55 dash cam, works ok but the standby battery/capacitor is shite, it’s meant to be removable if you have an accident so you can take pictures but the battery runs out in a few seconds – quite a common fault apparently, for a third of the price i’d just get a cheap next base cam from halfords/amazon etc – get it hardwired into the vehicles ignition system and hide the wires under the headlining etc