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document updated 10 years ago, on Apr 17, 2015

There are devices that will cutoff power to your auxiliary devices, if the car battery power drops too low.

Info about these:

GREAT ADVICE @dashcamtalk.com
- It has a chart to help you determine what cut-off voltage you need.
- NOTE that the cut-off voltage depends on temperature!

The DashCamTalk.com website includes this very helpful chart:

Product	Price	Shut-off Voltage	Shut-off Time	Where to Buy
Cowon UP2	$25	N/A	No Time Setting	eBay.com eBay.co.uk Amazon.com
FineVu Perfect Power	$30	11.8	No time setting	Amazon.com
BlackVue Power Magic	$35	11.8, 12	1,2,6,12,24,36, 48,72
Lukas LK-290	$40	11.8, 12, 12.2, 12.4	12,24,36,48	eBay.com eBay.co.uk
Itronics ITV-80	$40	11.6, 11.8, 12, 12.2	12,24,36,48	eBay.com eBay.co.uk
Multi Safer	$40	11.6, 11.8, 12, 12.2	6,12,24,Unlimited	Amazon.com eBay.com eRoadCam
BlackVue Power Magic Pro	$45	11.8, 12	6,12,24,36,48, 72,120,Infinity	eBay.com eBay.co.uk Amazon.com
Smarter+	$45	11.4,11.76	2 to 48 hours	eBay.com eBay.co.uk
Blackvue Power Magic Pro 2	$70	11.8, 12	6,12,24,36,48, 72,120,Infinity	eBay.com eBay.co.uk