Power, explained
How are dash cams powered?
Three ways. The cigarette lighter or 12V accessory socket, the simplest and most common route. A hardwire kit, wired directly into the fuse box on a circuit chosen for the job. Or an internal battery or supercapacitor, which lets the camera run without any cable to the car's electrics at all for a short period. Only the hardwire route reliably keeps a camera recording once the ignition is switched off, which is the whole reason it exists as a separate purchase.
The three power routes
Cigarette lighter socket. Plug in and go, which is why it's the default on almost every camera. The trade-off is that in most cars this socket sits on a circuit that switches off with the ignition, so the camera loses power the moment you turn the key off.
Hardwire kit. Wires connect directly into the fuse box, tapped into a fuse chosen specifically because it stays live with the ignition off. This is the only route of the three built to keep a camera running through parking mode.
Internal battery or supercapacitor. A small onboard power store lets the camera run briefly without any connection to the car at all, commonly used to finish saving a clip safely if power is cut, or to run limited parking mode detection on some models. It is not a substitute for a car's own electrics over any real length of time.
Supercapacitor vs lithium battery: why hot cars change the calculation
A lithium battery stores energy through a chemical reaction, and that reaction is sensitive to heat: repeated exposure to high temperatures degrades a lithium cell faster over time and, in the worst cases, raises the risk of the cell swelling or failing. A car's interior in direct sun is exactly the kind of environment that stresses a lithium cell this way, repeatedly, over years.
A supercapacitor stores energy electrostatically instead of chemically, with no reaction to degrade. That makes it far more tolerant of heat and cold, and it does not wear out through repeated charge cycles the way a battery does. The trade-off is that a capacitor holds far less energy for its size than a battery does, which is why it's used for short duration jobs like safely closing a file after a power cut, not for running a camera for hours with the engine off.
How much power does a dash cam actually use
We are not going to quote an amp figure here that we cannot source, and the honest answer is that it varies by camera, resolution and detection mode in any case. What matters for a driver is the shape of the risk, not a precise number: dash cams draw very little compared with what it takes to start an engine, so the thing that actually flattens a battery is time, a camera left running for hours or days with the ignition off, not the current it draws at any single moment. That is exactly the problem a low voltage cut off exists to solve.
Wiring it properly
If you want the camera running while the car is parked, you need the hardwire route, which means choosing the right fuse and understanding what it costs. Start with which fuse to use, by car model, then see what a hardwire kit and its fitting cost, and go deeper on what that power actually gets you on does a dash cam record when the car is off.
Questions
How are dash cams powered?
Three ways: the cigarette lighter or 12V accessory socket, a hardwire kit wired directly to the fuse box, or an internal battery or supercapacitor for standalone power. Only the hardwire route reliably keeps a camera running once the ignition is off.
What connector do dash cams use for power?
Most ship with a cable ending in a standard 12V cigarette lighter plug, which is the simplest way to power one but leaves the socket shared with anything else you plug in. A hardwire kit replaces that plug with wires connected directly into the fuse box instead.
What's the difference between a supercapacitor and a battery in a dash cam?
A lithium battery stores energy chemically and tends to degrade faster, and can pose more of a safety risk, when repeatedly exposed to high heat. A supercapacitor stores energy electrostatically instead, which tolerates heat far better and does not carry the same degradation curve, which is why some cameras built for hot car interiors use one in place of a battery.
How many amps does a dash cam use?
We are not going to quote a figure we cannot source, and current draw varies by camera and by resolution in any case. What matters practically is that dash cams draw very little compared with starting the engine: the real risk to your battery is how long the camera runs while the engine isn't charging it, not how much current it pulls at any one moment.
Will a dash cam drain my car battery?
Only if it keeps running for long enough with the ignition off and nothing protecting the battery. A hardwire kit fitted with a working low voltage cut off disconnects the camera once voltage drops to a preset level, which is what actually prevents a flat battery, not the amount of current the camera itself uses.
Last reviewed 10 July 2026