What does parking mode actually record?
Updated 2026-09-23
Four different things. Impact-triggered recording starts when the G-sensor fires, by which point the car that hit you is already leaving. Time-lapse records continuously at one to three frames a second. A buffered mode keeps a rolling few seconds in memory so the approach is saved as well as the impact. A radar mode wakes the camera when something moves nearby, before contact — the only version that catches the approach without leaving the camera awake all night.
Why the buffer is the feature
The clip that matters in a parking incident is almost never the impact itself. It is the ten seconds before: the car pulling in, the door opening, the person walking up. A camera that starts recording on impact gives you a jolt and a taillight. A buffered mode keeps a rolling few seconds in memory at all times and writes them out ahead of the trigger, which is the difference between footage that identifies someone and footage that proves something happened.
The power arithmetic
Buffered mode means the camera is awake and encoding continuously, which draws real current — enough that owners of one radar-equipped camera measure about ten percent of a car battery overnight even in its energy-saving mode, implying roughly ten days before the car will not start. Deep-sleep modes on the newest cameras claim draws under a milliamp, turning standby into weeks, at the cost of a wake-up delay measured in a second or two. Radar sits in between: the camera sleeps, the radar watches, and the camera wakes before contact rather than after.
What a battery pack changes
A dedicated dash cam battery pack charges while you drive and runs the camera when you do not, which removes the whole problem — the car battery is never touched, so the cutoff never has to compromise. It is the standard answer for anyone running three or four channels, or parking for days at a time. It costs as much as a mid-range camera and has to live somewhere, usually under a seat.
The mode that is not worth having
Motion detection without a buffer is the weakest option and it is the one most budget cameras mean by 24-hour parking mode. It triggers on passing pedestrians, shadows and headlights, fills the card with nothing, and still starts recording too late for the event you care about. If motion-only is all a camera offers, its parking mode is closer to a checkbox than a capability.