AUTOOL OBD II Car Memory Saver Cable 12V Vehicle ECU Emergency Power Supply Cable Digital Display OBD II Battery Leakage Detective Kit with 3A Fuse & 2 Alligator Clips

Used this tool to replace the battery on a Toyota Avalon. I used the 12volt battery out of my home alarm system to power this tool, It worked perfectly. All of the cars memory remained intact: the express windows, the memory seats and all of my radio presets.

I'm very pleased with this device. I received it yesterday and used it today to swap a dying battery in a 2023 Subaru Legacy in my driveway during the early February 2026 deep freeze in the northeast US. Given the 19 degree F weather, I didn't want any confusion or trouble with the AUTOOL OBD II Car Memory Saver and it didn't give me any. For the sustaining battery to drive the device and keep the electronics in the car powered during the swap procedure, I used a spare fully-charged 12-volt lead acid battery from a Tripp-Lite UPS. The large alligator clips on the memory saver were a bit big for the contacts on the battery, but they held well throughout. I then connected the memory saver to the car's OBD II diagnostic port under the dashboard. When I powered up the device, the voltage display showed 12.6 volts which is correct, but it also showed 1.2 amps of current as well. The current was a bit disconcerting, and it didn't seem to be caused by the interior lights in the car, but I proceeded with the car battery swap anyway. Despite the "leaking" current I didn't remove any fuses from the car as suggested by the user manual. I watched several YouTube videos that explained how to use similar less-sophisticated car memory saver devices, but in none of the videos were any fuses removed from the cars. However only this AUTOOL tool had a voltage and amperage display on it, the others in the videos did not, so perhaps ignorance was bliss for them. Crossing my fingers I went ahead with replacing the battery in the car, starting by disconnecting the battery negative terminal, then moving on to the battery positive terminal. One thing that is VERY important is that when the battery positive terminal is removed under the hood, to wrap it securely with some sort of insulating material to prevent it from touching nearby bare metal. This terminal, which would normally be inert during a normal battery replacement, remains live when a car memory saver is in place and is active. I placed a small cardboard box around the terminal and then wrapped a lot of insulating tape around it. In the Subaru Legacy, the battery positive cabling is stiff and unwieldy, with the battery itself being difficult to grab onto and retrieve, so I was really afraid of making a mistake and shorting the cable to ground while wrestling with the old and new batteries. Eventually the old battery came out and the new one went in. I unwrapped and reconnected the battery positive cable, and then reconnected the battery negative cable and tightened all the 10mm nuts. I then powered off and disconnected the AUTOOL OBD II car memory saver, which had continued to show a constant 12.6 volts during the entire battery replacement process. I crossed my fingers and pushed the engine start button, and the engine started with no trouble. The settings in the car's computer were still all intact, down to the radio station presets. I definitely recommend this device to anyone who needs to replace a battery on any recent-vintage car with an OBD II port (OBD appeared in 1996). My one reservation was that I wish that the device also had a cigarette-lighter-style connection, so that I could use my NOCO Boost Pro jump starter device to provide the sustaining voltage to it, but it should be pretty easy to find a conversion connector that I can use for this. The Tripp-Lite 12V UPS battery I used is much smaller than the jump starter, but I always carry the jump starter with me and I think this would be more convenient overall.

This product works very well. The ease of use and simplicity of this tool. I had it a short time and I'm liking it so far. I purchased it for the specific reason so that I could see the voltage and amperage because when working on today's vehicles , especially when dealing with the battery you need a steady power supply. Especially when working on the ANYTHING dealing with voltage or amperage that is the only way to get a TRUE and correct reading. Yes, it's worth the money. The only reason I give it 4 stars is that you better have EXTRA fuses. Now the tool does come with an extra fuse , but you better have more .

Works perfectly, should have got one years ago, saved memory on wife’s bmw

Didn't work both times I used it would return but its to late

Somehow I really didn't think this would work. My Ford Bronco is kind of mysterious with it's power systems, and it just seemed like it somehow wouldn't work... But I pressed on with my battery swap. Swapped it out, disconnected everything and turned on the Bronco. No settings lost. Very cool.

I use this to change out a battery in my car and my mother-in-law’s car and it worked perfectly. Easy to use and all my cars settings were saved, which was so convenient.

Works very well decently built, good price, I would like it a lot more if it had a 12v outlet plug instead of just alligator clips very easy to use

This product is brilliant it saves a lot of messing about with a obd reader when you change your battery

Excellent, easy to use, battery change without losing car data. Good quality. A+++

feels cheap as battery cables seem too thin gauge but does work as advertised. also can be use to quickly check for parasitic draw on your cars battery system

Wenn man an seinem Auto eine Batterie wechseln möchte und keine Lust hat nach dem wechseln wieder alles neu einzurichten bzw. einzustellen braucht man solch ein Tool. Es wird an den OBD II angeschlossen und mit einer externe Batterie mit Strom versorgt. Dann in ruhe die KFZ Batterie austauschen. Zum Schluss wird das Tool entfernt und alles ist save.

Facilissimo e sicuro da utilizzare. Al posto dei più empirici sistemi, in cui i rischi di stacco erano molto elevati, questo, permette di lavorare in sicurezza al 💯 x 💯.