Question About Disconnecting The Battery

[wchettel]

Yesterday evening I was perusing forum discussions about Torque OBD Scanner Software and ran across this post:

"Quick heads up from a very experienced auto technician, DO NOT EVER DISCONNECT A VEHICLE BATTERY WITHOUT AN ALTERNATE POWER SOURCE. I.e. a 6v lantern battery will service hooked up via power and ground cables with sufficient gauge wire and alligator clips preferably isolated locking ones and allways connect power first then your ground last. My reason for this interjection is not to make anyone feel less adequate, but just a heads up. Not only is radio memory at risk of loss due to battery disconnect but anything that utilizes keep alive memory - examples are individual seat heating or seat memory settings. If you happen to ever be dealing with let’s say a Cadillac you could end up into a very extensive repair bill for reprogramming flashing costs due to a battery disconnection in most of them will reset almost every module in the vehicle and on Cadillac especially there is one for every function in the vehicle hope the educates some and stops any misfortunes from happening to y’all. "

Is this "alternate power source" necessary or advisable on the Genesis Sedan when disconnecting the battery?

 

[GenesisCaptain]

What is the source of the quote? It is a hoot!

 

[FastDEW1]

This is hogwash. Total and complete hogwash.

It is at least humorous!!! Otherwise, its useless.....

 

[videopho]

Other than some minor inconveniences such as reset seating position memories, rekey the stereo pass code and time of day clock etc. Otherwise, nothing else to be worried about.
In fact many autopart stores plug in their portable back up battery when changing out the dying battery out of your car so you don't have to go thru the hassle as described.

 

[NSXNEXT]

I have disconnected my battery 5 times in the last week trying to center my new wood steering wheel (had to disconnect airbag) and have had no ill effects.

 

[dts2]

My R Spec sits in Las Vegas weeks at a time with the battery disconnected and each time I connect it, the only thing I have to reset is the clock. Not to say that some cars are more finicky than others, but not the Genesis. In fact, I was very surprised that the memory was nonvolatile.