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document updated 9 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