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Battery change memory savers #4560689
10/31/17 09:39 PM
10/31/17 09:39 PM
Joined: Oct 2010
Posts: 1,807
.
Danh Offline OP
Danh  Offline OP
Joined: Oct 2010
Posts: 1,807
.
I have a new "memory saver" that attaches a 12V power source (e.g. Spare battery) to the car's OBDII port during a battery change to save radio presets, PCM "learning" and the like.

This seemed like a "no-brainer" and a smart thing to do but I see conflicting advice on, you guessed it, the Internet: some sources say it's prudent and almost essential but other say it's dangerous.

What's been the exprience here? Thanks.

Re: Battery change memory savers [Re: Danh] #4560712
10/31/17 10:10 PM
10/31/17 10:10 PM
Joined: Jun 2014
Posts: 1,844
Ca.
UncleDave Offline
UncleDave  Offline
Joined: Jun 2014
Posts: 1,844
Ca.
I tried using a saver on my lexus OBD port and lost everything this way.

Going forward I will use one of my smart chargers with a "maintain mode" for this connected direct to the battery leads.


UD


Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: Battery change memory savers [Re: Danh] #4560713
10/31/17 10:12 PM
10/31/17 10:12 PM
Joined: Oct 2017
Posts: 164
MI
HorseThief Offline
HorseThief  Offline
Joined: Oct 2017
Posts: 164
MI
depends on the vehicle and you have to be careful. ODB ports are only spec'd for 4 amps officially, but it depends on what fuse they're running off. Interior lights, auto lamps/DRL, fancy radio head units and the like can draw quite a bit of power

You have to plug it in and keep the doors closed to ensure the vehicle won't draw too much power. If you accidentally open the door with the battery disconnected, there's a small chance you could blow a fuse and have to go hunting for it.

Typically, when I have the time or it's important to not lose settings like security codes, I will use a small 12V SLA battery with test leads to battery lugs or fuse panel under the hood.

With proper precautions taken, they're very convenient to have around and if it has a 2 pin sae connector, it can be used with a bunch of different battery maintainers and low amperage chargers.

Some of the Noco chargers have a 12V 3-5A maintain/supply mode that works well for this.


I saw a brown dog
Re: Battery change memory savers [Re: Danh] #4560726
10/31/17 10:29 PM
10/31/17 10:29 PM
Joined: Jan 2006
Posts: 734
Los Gatos CA
djb Offline
djb  Offline
Joined: Jan 2006
Posts: 734
Los Gatos CA
The conventional device uses 9V battery hooked through the lighter socket.

A 9V battery doesn't need a fuse. It's so weak it can't put out enough current for a dome lamp, let alone blow the typical 15 amp fuse for the lighter socket.

You don't see these devices much any more. Most settings are stored in non-volatile memory, and a 9V battery isn't powerful enough to run the ECUs in not-quite-asleep mode.

I wouldn't use a smart charger, or a really dumb one. A smart charger will shut off when it doesn't detect a battery, and typically produces high frequency noise on the output that may not properly power ECUs. A dumb charger may output a high voltage with no load, and may be essentially unfiltered 60 Hz pulses.

Re: Battery change memory savers [Re: HorseThief] #4560727
10/31/17 10:30 PM
10/31/17 10:30 PM
Joined: Oct 2010
Posts: 1,807
.
Danh Offline OP
Danh  Offline OP
Joined: Oct 2010
Posts: 1,807
.
Originally Posted By: HorseThief
depends on the vehicle and you have to be careful. ODB ports are only spec'd for 4 amps officially, but it depends on what fuse they're running off. Interior lights, auto lamps/DRL, fancy radio head units and the like can draw quite a bit of power

You have to plug it in and keep the doors closed to ensure the vehicle won't draw too much power. If you accidentally open the door with the battery disconnected, there's a small chance you could blow a fuse and have to go hunting for it.

Typically, when I have the time or it's important to not lose settings like security codes, I will use a small 12V SLA battery with test leads to battery lugs or fuse panel under the hood.

With proper precautions taken, they're very convenient to have around and if it has a 2 pin sae connector, it can be used with a bunch of different battery maintainers and low amperage chargers.

Some of the Noco chargers have a 12V 3-5A maintain/supply mode that works well for this.


Just to be sure I understand, you'd rather use essentially a spare 12V lead-acid battery with jumper cables attached to the positive and negative battery cables than going through the OBDII port? Thanks.

Last edited by Danh; 10/31/17 10:30 PM.
Re: Battery change memory savers [Re: Danh] #4560737
10/31/17 10:46 PM
10/31/17 10:46 PM
Joined: Nov 2010
Posts: 2,820
California
Errtt Offline
Errtt  Offline
Joined: Nov 2010
Posts: 2,820
California
I just use my little jump starter at the battery cable terminals. Switched out 3 vehicle batteries recently, no issues.

Re: Battery change memory savers [Re: Danh] #4560800
11/01/17 12:51 AM
11/01/17 12:51 AM
Joined: Apr 2017
Posts: 1,157
SF BAY AREA, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 1,157
SF BAY AREA, CA
I change a lot of batteries on a lot of cars at work (auto parts store) and we never bother with the stupid obd2 memory saver gizmo that corporate tells us to use... never any problems. most cars, especially newer toyotas, stall right away the first time it gets started after a battery replacement since it hasn't learned idle but on the second start it's all good.


2010 Ford Escape FWD 2.5 ~90K Miles
Currently: Royal Purple 5W-30, Wix 51348
I prefer Royal Purple, Valvoline, Castrol, and O'Reilly oils.
Re: Battery change memory savers [Re: Danh] #4560817
11/01/17 02:36 AM
11/01/17 02:36 AM
Joined: Aug 2010
Posts: 12,906
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,906
Northern Kentucky
I have a jump n carry that has a 12v out cigarette lighter style plug, and my outlet in my car stays hot all the time so I just hook them together and it even has enough power to run the power locks and lights without blowing a fuse.

I saw they make a new product that plugs into obd and that's its only function.

https://www.cloreautomotive.com/sku.php?id=554


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: Battery change memory savers [Re: Danh] #4560864
11/01/17 05:40 AM
11/01/17 05:40 AM
Joined: Jul 2005
Posts: 160
Singapore
kb27 Offline
kb27  Offline
Joined: Jul 2005
Posts: 160
Singapore
For memory saving, I use a small lithium-ion jump starter plugged into the DC socket, with a modified cable, EC5 connector and a fused plug.
Then I'd turn on the ignition to connect up the circuit, before replacing battery.

I tried to connect at the battery terminal, but sometimes, the clip would slipped off or get knocked off by my changing of the battery.

The DC socket way is more reliable, but have to watch out for high current drain from devices, such as hazard lights, and DRL lights that won't go off.

Re: Battery change memory savers [Re: Danh] #4560871
11/01/17 05:51 AM
11/01/17 05:51 AM
Joined: Aug 2008
Posts: 19,501
Ontario, Canada
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 19,501
Ontario, Canada
I have used the 9 volt in the cigarette lighter for decades and have 0 issues. It's fused and it has a diode.
Just be sure to use it in a port that isn't wired to shut-off with the key.

Last edited by StevieC; 11/01/17 05:52 AM.

'18 Dodge Grand Caravan GT - Valvoline (Break-in)
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: Battery change memory savers [Re: Danh] #4560885
11/01/17 06:12 AM
11/01/17 06:12 AM
Joined: Jan 2003
Posts: 3,121
Coastal South Carolina
edwardh1 Offline
edwardh1  Offline
Joined: Jan 2003
Posts: 3,121
Coastal South Carolina
odd that the car maker does not cover this in the owners manual


These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year
Re: Battery change memory savers [Re: Danh] #4560903
11/01/17 06:42 AM
11/01/17 06:42 AM
Joined: Dec 2003
Posts: 9,843
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,843
Florida, Cape Coral
I just write down my radio stations etc and it takes me about 2 minutes to re-install. No mess-no foul and good to go. Ed


CX5 Touring 2.5L :-)
Re: Battery change memory savers [Re: Danh] #4560922
11/01/17 07:18 AM
11/01/17 07:18 AM
Joined: Apr 2013
Posts: 174
Kevil,Ky
vwmaniaman Offline
vwmaniaman  Offline
Joined: Apr 2013
Posts: 174
Kevil,Ky
+1 on the jump starter


Don't waste your time on a slipshod repair.
Re: Battery change memory savers [Re: Eddie] #4560931
11/01/17 07:29 AM
11/01/17 07:29 AM
Joined: Dec 2004
Posts: 2,541
Chicago Area
opus1 Offline
opus1  Offline
Joined: Dec 2004
Posts: 2,541
Chicago Area
Originally Posted By: Eddie
I just write down my radio stations etc and it takes me about 2 minutes to re-install. No mess-no foul and good to go. Ed
I just changed the battery in the Cobalt, no maintainer, and interestingly enough, the radio retained all the station settings, but the clock needed to be reset.

I did take pictures on my phone of all 5 preset banks just in case, but didn't need them.


Current Fleet:

2010 Hyundai Sonata GLS
2009 Chevy Cobalt SS Sedan (yes,the turbo)
2002 Dodge Dakota SXT Club Cab
1994 Ford Ranger XLT (RIP, Dad)
Re: Battery change memory savers [Re: vwmaniaman] #4561086
11/01/17 10:17 AM
11/01/17 10:17 AM
Joined: Nov 2013
Posts: 1,928
Chicago, IL
EdwardC Offline
EdwardC  Offline
Joined: Nov 2013
Posts: 1,928
Chicago, IL
Originally Posted By: vwmaniaman
+1 on the jump starter


Same here, I leave a jump starter with the spring clamps attached to the battery leads and a ground somewhere. It is a little tougher to deal with since the clamps can slip off while installing the new battery, but I manage considering how infrequently I have to do this procedure.

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