6.8" Aukey DRA2 1080p Touchscreen Mirror Dash Cam w/ Front & Rear Cam EXPIRED

Dashcams typically have a capacitator or battery to allow it to finish saving its footage in case power is lost -- which happens when you turn the car off (if it's not wired to have power all the time) and often happens in a collision.

Without this ... you may very well lose the file that it was writing at the time of the crash entirely (though it may be recoverable to some degree), or at least the last few seconds of footage (which can't be recovered, as it was never written) -- which are likely to be critical.

Using an ultracapacitor is good in that it doesn't care about heat or cold -- for example, here in Texas your dashcam often sits in the sun all day and that heat ruins a battery with a quickness. Ultracapacatators don't care about the heat, and ought to last forever.

That said, ultracapacitors do have two downsides: they tend to be physically bigger than an appropriate battery would be (so the dashcam can't be made quite as small) and they tend to only carry enough power to run it for a few seconds rather than a few minutes or more. That said, a few seconds should be sufficient to write all collected data to the sdcard and probably finish the current file before shutting off.

Integral for time travel when you hit 88mph...

your post is junk