Can a Dash Cam Record When the Car is Off?
3 Answers
If the dash cam is equipped with a parking monitoring function, it can continue recording after the vehicle is turned off, although the recording duration is limited since the dash cam is not being charged when the vehicle is off. There are two types of parking monitoring functions for dash cams: one is continuous recording, and the other only activates short-duration recording when the vehicle detects vibration. However, there are currently no dash cams capable of continuously recording for an extended period after the vehicle is turned off. Relevant information about dash cams is as follows: Introduction: A dash cam is a device that records video, audio, and other related information during vehicle operation. Function: After installing a dash cam, it can record the entire driving process, including video images and sound, which can provide evidence in the event of a traffic accident.
I've installed several dash cams and tested whether they continue working after the engine is turned off. The results show this depends on the model and settings. Some cheaper models use built-in lithium batteries that can last a few hours after shutdown, automatically activating—especially in parking surveillance mode, where they start recording upon detecting vibrations, like when my neighbor's car brushed against mine, proving very useful. However, the battery capacity is limited, so they can't record for long and require regular charging or battery life checks. Higher-end models connected to a constant power source will keep working after shutdown, but they drain the car battery quickly and might damage it. I recommend buying one with smart sensing features for hassle-free security, and always check the manual to set up delayed shutdown or motion detection. In short, choose the right configuration over cheap options to avoid wasting money.
From my experience tinkering with car modifications, the key to a dashcam recording after the engine is off lies in power supply design. There are two types to consider: those with supercapacitors only work when the vehicle is running and stop once the engine is off; models with lithium batteries can continue recording for several tens of minutes or even longer after the engine is turned off, especially in motion detection mode where they power on to capture data when a vehicle approaches or vibration is detected—this is highly practical. In terms of wiring, if connected to the ACC port, the dashcam will lose power when the engine is off, but choosing the BAT line or direct fuse box wiring allows for 24/7 operation. However, be cautious not to drain the car battery, which could lead to starting difficulties and affect the vehicle's lifespan. It's best to regularly check the dashcam settings to minimize unnecessary power consumption. When installing, don't cut corners—seek help from a professional to avoid causing a short circuit.
