An automotive memory saver is a device that provides temporary power to the vehicle when the main battery is disconnected. It connects via jumper cables and supplies power to the vehicle’s computer and electronic control modules during battery replacement to prevent data loss.
1 SECURITY PROTECTION
2 NOTES
1 VOLTAGE & CURRENT DISPLAY
2 16-PIN INTERFACE
1 INSULATED CLAMPS
2 COPPER WIRE CORD
1 UPGRADE
2 PRODUCT PARAMETERS
3 HOW TO USE THE B80
AUTOMOTIVE ELECTRICAL LEAKAGE DETECTION 1. Backup Power Connection
Prepare fully charged spare battery, correctly connect clips to battery terminals (red to positive, black to negative) → Device displays voltage
2. OBD Connection
Connect device OBD interface to vehicle OBD port
3. Critical Circuit Preservation
→ Remove vehicle fuses individually, retaining only ECU/power-critical circuits → Prevents component leakage from triggering device overcurrent protection (avoids ECU data loss)
4. Disconnect Battery Negative Terminal
→ Keep disconnected terminal clear of metal parts (prevents shorts) → Current will fluctuate due to relay contact operation
5.Identify Leaking Circuits
Pull out and plug in the fuses in the vehicle’s fuse box one by one and monitor current fluctuations. A sudden current increase indicates potential leakage in the fuse’s circuit. At this point, refer to the vehicle circuit diagram to locate the circuit where the fuse is located and conduct leakage inspection on that circuit.
[Upgraded OBDII Memory Saver Cable] MRCARTOOL B80 Car Memory Saver is specifically designed for automotive battery replacement.When replacing the vehicle battery, connect a spare battery and the vehicle’s OBD2 interface to the B80 emergency power cable to prevent loss of vehicle operating data.
[Voltage and Current Display]Automotive Memory Saver with Real-Time Voltage and Current Display.Voltage Display: Shows battery voltage during replacement (prevents using depleted batteries; ensures uninterrupted power).Current Display: Detects circuit leaks or measures vehicle quiescent current in ignition-off state.
[Auto Leakage Detection Function] The automotive battery replacement memory saver enables preliminary detection of vehicle leakage by monitoring current values. Simply remove fuses in the car’s fuse box one by one and observe current fluctuations. A sudden increase in current indicates potential leakage in the circuit corresponding to that fuse.
[Safety Protection] Device operating voltage range: 10~14V. Triggers an audible alarm when voltage is <10V or >14V. Automatically activates power-off protection if device voltage exceeds 16V. Features auto-polarity recognition to prevent reverse connection damage; includes built-in 3A fast-blow fuse for overload protection.
NOTE: The B80 can only be used as an emergency power supply for car battery replacement and cannot be used to power car computers for a long time. Please replace and install a new car battery as soon as possible.
Chucho –
Nice little gadget
Wires and clamps look solid and plastic battery pack feels slightly thin but worked great. I used it on a ‘06 Honda Pilot. 5 stars for the price.
Oldies Guy –
Worked Perfectly! Saved all the settings!
Hi Everyone,This gadget worked perfectly! I have a 2016 Lexus ES300h (hybrid) and it wastime to change the 12v battery. I didn’t have a spare battery so I installed the8 AA batteries in the case as directed. I flipped on the little switch thingie, pluggedit into the OBD, and then changed the 12v battery. Took about 10 minutes.All the settings were saved including the radio. Recommended!
Anonymoose –
Worked very well, AA batteries make it easy to reuse when needed
Just received this today, put in 8 AA batteries, turned it on, plugged it in, changed the battery and … no problems at all. It’s like the battery was never disconnected.I really like the AA battery option as I can always find those and they are easy to transport. It worked great.The only improvements would be clearer on/off state separate from the OBD socket. The battery pack has a small switch to turn it on or off, and doing so will turn on an LED light on the battery saver’s OBD socket. This is to let you know the socket is getting power from the AA batteries (or 12v source). BUT if you plug it into the OBD while the old car battery is still connected (and has a small amount of power) the LED light will also come on (whether batteries are there or not), potentially tricking you into thinking the batteries are powering it. If you didn’t turn on the memory saver but remove the old battery – well, it’s too late.To be clear: the Memory Saver is in two pieces – the battery pack and the OBD plug/clamps. Connect them together.1) put the AA batteries in. There is a little switch on the battery box – move the switch until you turn on the LED light on the OBD plug. This means the OBD will be powered by the AA batteries when plugged into the car.2) leave the power on and plug the Memory Saver’s OBD plug into the car’s OBD port . Do not move the switch.3) go ahead and change the car battery4) when all done, remove the Memory Saver from OBD port
Amazon Customer –
Works as Advertised
Works well. I changed batteries in two cars using the AA battery option to keep settings and it worked as advertised.
DFilbert –
Good quality – but should have a diode built in for reverse voltage blockage.
This item needs to be connected thru the cars OBD II connector before removing the car’s battery. So – that means it is subjected to the car’s voltage for a while – which can be like 13.5 volts. If the power source voltage for the OBD II is less than the car battery voltage – then current will flow from the car battery into the OBD II power source. This would not be good for simple AA batteries or a 12 volt charger or electronics wall charger type of source. I recommend installing a zener diode to prevent reverse current flow. It’s fast switching and only a small 0.3 V forward bias voltage drop. It should have been part of the product.
Ronald M. –
Provides 12 volt temporary power for the computer.
This tool retains all computer settings while the battery is removed and replaced. On my C8 Corvette all of my personal settings were retained. Good tool at a reasonable price.
hgb11 –
It works great.
I used this while changing my battery and it kept all my presets, clock setting, etc. I made sure that the car door was shut after connecting to the OBD-II connector so no interior lights, dash lights etc, would drain the batteries. I did not connect it until I was ready to take the cables off the old car battery. It kept power to the car electronics for about 20 minutes while I disconnected the old car battery, swapped the new one in, and reconnected the new one. It is easy to use and the light on the OBD connector makes it easy to see under the dash so you can see the connector.
J. Herbst –
Perfect – Very Happy With It
I needed to change out an old auto battery and I really wanted to avoid losing my radio settings, clock, other preferences and OBD info for a change. I also did not have a spare battery and didn’t want to take a chance using the new battery with jumper cables like a circus performer. I used the included AA battery pack (8 batteries, not included) and connected it to the OBD port under the dash. I took my time and carefully changed out the battery. When I was done I disconnected this unit from the OBD and voila, all my settings were intact. I couldn’t be happier. The pic shows everything included. I put some blue tape over the clips that are meant for attaching my to a spare 12v battery. I didn’t want to take a chance that one of the clips (especially the positive) would inadvertently touch something under the dash and short out the car’s computer. It was probably unlikely, but I left nothing to chance. The tape can be peeled off later if I need it.
JP –
The MR CARTOOL E60 ECU Memory Saver is a must-have tool if you’re replacing your car battery and want to avoid losing ECU data, radio presets, and other saved settings. I recently used it during a battery swap, and it worked flawlessly.What I really like is the dual power supply options: you can either use a 12V car battery/jump starter with the clip connector or insert 8 AA batteries into the included battery box. Personally, I did some modification & set up power supply form my portable car jump starter, which I believe is the safest and most convenient way to feed continuous power to the ECU. I have attached pictures and video if someone needs to take that route.⚡ Performance: It provided steady backup power, and I didn’t lose any data while changing the battery. Just be careful when handling the positive (+) terminal to avoid accidental contact with the car’s body.💡 Ease of Use: Simple plug-and-play design. It connects directly to the OBD2 port, and the process is straightforward even for someone not very technical.🤝 Customer Service: I had a minor issue with my first unit, but MR CARTOOL’s customer service was outstanding. They quickly replaced the product and even followed up with technical support to make sure everything was working. That level of service is rare these days and much appreciated.✅ Overall:Easy to useReliable power backup for ECU during battery changesFlexible power source optionsExcellent customer supportHighly recommended for anyone who wants peace of mind while replacing their car battery.
Tom –
Used this during a battery change so I would not lose any settings on my vehicle. It worked. I used the battery pack as it was easier and lighter than using another car battery for the power supply.
Victor Olmos Villanueva –
Muy buena herramienta con esta no se desprograma o se borran los comandos establecidos en el auto.
David –
Logro mantener la memoria de mi camioneta cuando realícele el cambio, no tarde mas de 3 min pero supongo podría darme mas tiempo en caso de tener que limpiar las terminales o hacer reparaciones menores, tener la opción de usar pilas AA fue lo que me convenció para comprarlo, use pilas recargable de 1.2V, trate de tenerlas completamente cargadas para llegar a su máximo voltaje que me daba aproximadamente 1.3V y sin ningún problema, pero creo seria bueno en caso de usar baterías recargables buscar que sean de 1.5 V para lograr llegar a los 12 V
anna topfer –
worked like a charm …highly recommended