Blackvue provides a fairly handy table. The single camera setups draw around 2-3W depending on your connections, and dual camera setups draw 3.5-5.4W.Surely, you can use a USB backup battery to run your dashcam 24/7, no? And have the USB backup battery charge when you drive? How much power do these dash cams draw?
You can put them in a flameproof box (like the ones used for document storage) if you are really concerned about fire, but you would probably have to have it in the trunk and route a wire to front, as it'll take up quite some space.We need to use a USB / car battery that's rated for higher temperatures to avoid battery swelling, leakage, or fires. 12V LiFePo4 is what's usually recommended. Frankly I don't want to risk burning down a $50,000 car (and everything nearby) with a $200 Li-ion battery. Hopefully the ones designed for this won't cause a fire.
Yeah the Blackvue packs are LiFePo4 also. In general LFP is safer from a fire perspective. Small correction on previous post, a single cam can run for 50 hours on 100Wh (divided incorrectly for 2 cams to get 25 hours).The two main dashcam batteries Cellink Neo and Blackvue Power Magic battery pack are lower Wh / mAh than alternatives like Beaudens and more expensive.
Yeah, as I mention you are unlikely to find a dash cam with that kind of low power mode as all of the motion detection basically works using the camera and they don't have a separate motion sensor. There are some with g-sensors to detect the car shaking, but that might not trigger at all for more minor things like car dings. Best bet if you want that function is to find a battery powered security camera and find some way to mount it in your car (or if you have assigned parking, somewhere outside the car).Most of the dash cams record always in parking mode so they capture the moments before the incident. Unfortunately that uses the battery very quickly. I'd be happy with recording whenever motion is detected, which would be much lower power consumption, and I'd just identify who did what afterward.
Thinkware seems to claim much longer battery life if using Energy Saving mode, although that one only detects impacts (not motion based). There is a separate radar module that can be used to detect motion.Just to follow up for future google searches, I tried:
Garmin Dash Cam Mini but it was always on and not motion activated, despite what their marketing claims.
THINKWARE U1000 but it also was always on. The software is super screwy, the app is horrible, and the camera itself has a voice that won't shut up during setup.
I did the above with a LiFePO4 (Lithium Iron Phosphate) battery, which both cameras drained in hours.
Back to look at external security cameras.