OBD2 Memory Saver 

You are the only guy who mentioned that the Positive terminal was hot when the memory saver was hooked up. Good job.

It’s interesting that jumper pack manufacturers don’t make and sell these cables that plug directly into their power packs. They could make a few bucks just for the convenience. Thanks for the excellent demonstration.

I used a old glove to store positive main battery terminal so no grounding. Thanks

Great video!! Found out the hard way this weekend that disconnecting your cars negative battery cable to do vehicle maintenance for a few hours will cause this pain that I had on my 2011 N1$$^N. Not only will it erase your codes and radio preset settings, it may also affect your vehicles immobilization/security features. After a spark plug and ignition coil change, I tidied up my work, reconnected my negative cable and NO crank and NO start. Turns out my battery was disconnected long enough for the BCM or Body Control Module to go "Dumb". You may attempt a reset of the security system but that's another full day. In closing, I'll be getting myself the OBD2 9v variant before maintenance of this kind is performed again. Now I'm smarter. Be safe all....thanks!

Great video Rich. Especially the reminder that the pos cable will be hot!

You don't need this ... I simply connect my battery charger set at the lowest setting 2 amp in my case and connected to both the cars battery terminal leads. Simply disconnect the battery while the charger is still connected to the battery leads , install the new battery connect the leads to it and disconnect the battery charger from the battery leads. All done ...works every time.

Thanks for the video, it was informative. That 12 V battery does not have enough voltage and thats why LED on the cable does not turn on when you connect it. That being said, cars are usually OK with a little less voltage.

I have one that has the lighter plug and alligator clips and uses a 9 volt battery. Works well as long as it's just a few hours. I like the OBDII idea.

Using one of these memory savers and changing the starter out if you touch your wrench to the positive side of the starter and then to the frame of the car will it Arc just as if you had the battery in it?

Also remember with the states and certain cities in Canada that have emissions tests --once you disconnect your battery without a memory saver, your vehicle will have to go through a relearn before it will pass an emission test

When diagnosing a problem, sometimes you don't want to lose the stored codes/data. Also if you want to pass an OBD2 smog test shortly after disconnecting the battery the computer has to show that it is ready.

I need to pick one of these up. Thanks for showing it Rich.

Can it save auto start/ stop for some car that 2020 + ? Because these car so sensitive after you replace starter, you need to reprogram auto start/stop.

If you have another car battery around is it safe to hook this to it? I see 9v options and this motorcycle battery you used. Does it matter what size battery you hook to?

I've seen comments on other videos that SOME very new cars will retain settings for about 30 minutes long enough to change the battery. Seeing that desktop computers have had CMOS batteries for decades it seems incredible that cars do not. In computers the CMOS battery is usually a CR2032 battery about the size of a small coin & they retain the computer settings when it's turned off. These batteries cost about $3.00 on Amazon!

It will save your presets and the radio security codes as well.

Did anyone check how much amperage the vcc pin for OBD can handle? If someone has a greater drain, as dome lights maybe, any other drain that someone doesn't know about, maybe you could damage obd wiring. I think the old-fashioned way of connecting a battery in parallel at the battery terminals is the way to go.

Can you just use another car's lighter socket to plug into instead of the additional battery?

So what exactly need to be done while changing the battery when hooked to an external 12v source AKA memory saver during new battery installation? I still go about removing the negative terminal first and then positive and make sure the positive terminal is covered with some kind of a rag so that it does not come into contact with any metal, I would then remove the old battery and install the new one and make sure to take out the rag and hook the positive first and then the negative. There would be no harm if you touch the positive terminal though (inadvertently) right? I would make sure to wear a glove though. Please let me know if I missed anything.

Why didn't you just buy a memory saver with battery clips instead of the 12V socket plug?

Can u put a link to buy that OBD memory saver ?

I'm currently making one of these but mine just has alligator clips on the end.

Yes the 96 lighter outlet should be live all the time

I have seen those with the 9 volt battery.

Am I correct to say the Saturn SL2 (1996) has an "unswitched" cigarette lightet outlet, meaning it always delivers 12 vdc, even with the ignition key in the off position?

Aww wow. Gee thanks for reminding me to make sure that the POSITIVE BATTERY CABLE doesn't touch EARTH or body of the car while disconnecting it from the Positive Battery Post. The Positive cable is alive because of the THE MEMORY SAVER. That touches ground. Ouch!! Cheers.

It is a innova 3130.

Remove the old battery when the car is working Then install the new battery. This does not cause data loss But I do not know if it could cause damage to other parts

Unless I am due for yearly inspection I don't bother. So what if OBD codes are lost. In few days (weeks) of driving they will get repopulated. It's good to start fresh every now and then. Think of it as rebooting your car's computers.

Hey Rich, They have a 9 Volt Bat., to Cig. Lighter, For under 10.00. Does the same thing, with just a 9 Volt Battery. Great Vids.

I'm not sure that the value in this is. Most of the work I do involves quick service crap, and we also do inspections. I simply wait until I've done the inspection, and then disconnect the battery if need be. This might be useful for people who do their own stuff before they bring their cars into the shop, to keep from failing and having to run the drive cycle.

An unusual way to feed power to the system. That led is good but another on the battery side would tell you when the battery is connected, a check for saver battery power, 1 led and a 1k resistor would do the trick :-)

How snug is the fit of that OBDII connector, climbing in and out of the car with all that wiring right there in the way could prove to be futile, BEWARE.

Nothing is bothered by having two power sources hooked to the car at once?

You mean the car battery we are replacing.

Yes it does.

By reading the title, i thought that you will show how to do one of these.

you must show how to protect + pole

You can also charge the small battery with this connection?

With this device, must you turn key to ACC or ignition before removing car battery?

Can we make cable from cigarette lighter to another cigarette lighter socket, then take battery off,???

Did the tool keep your fuel consumption read out?

Once you attached the car's new battery, at what point exactly did you disconnect the motorcycle battery?

Do I really need a memory saver to replace a car battery? I found an article on the internet saying or stating not to use such devices. What does anyone think? Thank you.

It's not that hard to just turn the ignition key to where the ACC or accessory mode is turned on, if needed, to energize the cigarette lighter et al. But spending ten times the cost is of course worth the effort - ?

Watching this is painful and the process so convoluted due to automakers cheap out on a replaceable battery ( couple bucks) or provide non volatile memory much like what's in your desktop, laptop computers. Never needed this, my odometer resets to zero, need to reset my clock, on one other car need access code to reset the radio, not a problem. If I have to I guess I install a pin out for the positive in the engine compartment and use the car frame as negative.

This is a Schumacher #inc12vobd

I connect long wire to the battery then remove the cable then put it down and put the new battery connect the cables and disconnect the wires, easy pizzi

Where did you buy those alligator clips?

so I saw the comment below just want to be sure you said it saves the radio security code? asking bc I want to upgrade my girlfriends battery and she lost the radio code card from Honda. if this saves the code it will save us the trouble of trying to coax this out of the dealer.

just taking off the neg side doesnt have any memory effect , right?

What kind of scan tool do you have? I like it!

Where did I buy

Why not just plug the "powerpack", or your moto battery setup, directly into the cigarette lighter ... WITH the understanding that the lighter must be live, and not switched by the ignition? My Audi lighter is live all the time, so it would seem to work for me. Good job on the warning regarding the live battery cable when connected to the battery saver.

What is the purpose of this? So what the codes are reset. Someone make me smart on this topic. Thanks.

Why bother with this when you can just connect your jump pack directly to the battery cable before the cables are disconnected from the old battery??!!!

Can you jump a car through the OBD 2 port?

does it save radio channels on radio????

Hey Rich does this save the radio presets as well? The reason I ask is because the pcm doesnt have anything to do with the radio does it? Thanks, Tom

What company sell this device?

can I use a 9 volt battery?

@ a

These products are a very bad idea, especially on newer cars with computer modules on a network. On later model BMW cars, you will either blow the Instrument cluster fuse, or worse, destroy the cluster. (I've seen it happen) These products are not endorsed by most master technicians including me. Not trying to cause controversy, but rather save somebody lots of heartache.