---
product_id: 655438123
title: "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"
brand: "autool"
price: "HK$382"
currency: HKD
in_stock: true
reviews_count: 13
category: "Autool"
url: https://www.desertcart.hk/products/655438123-autool-obd-ii-car-memory-saver-cable-12v-vehicle-ecu
store_origin: HK
region: Hong Kong
---

# Real-time voltage & current display 12V DC power compatibility 3A fuse overload protection 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

**Brand:** autool
**Price:** HK$382
**Availability:** ✅ In Stock

## Summary

> 🔧 Power up your battery swap game—never lose your car’s memory again!

## Quick Answers

- **What is this?** 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 by autool
- **How much does it cost?** HK$382 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/655438123-autool-obd-ii-car-memory-saver-cable-12v-vehicle-ecu)

## Best For

- autool enthusiasts

## Why This Product

- Trusted autool brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built-in Safety Fuse:** 3A fuse guards against overloads, protecting both your vehicle and device.
- • **Smart Leakage Detection:** Pinpoint electrical leaks by isolating fuses with real-time current feedback.
- • **Universal 12V Compatibility:** Works flawlessly with any 12V DC source—from lead-acid batteries to running starters.
- • **Seamless ECU Memory Protection:** Keep your car’s settings intact during battery swaps—no resets, no hassle.
- • **Live Voltage & Current Monitoring:** Instant digital readout ensures you’re always in control of power flow.

## Overview

The AUTOOL OBD II Car Memory Saver Cable is a professional-grade 12V power supply tool designed to maintain your vehicle’s ECU memory during battery replacement. Featuring a digital display for real-time voltage and current monitoring, integrated 3A fuse protection, and advanced leakage detection via OBD II port, it ensures a seamless, safe, and efficient battery swap process for modern vehicles with OBD II ports.

## Description

Buy 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: Code Readers & Scan Tools - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Tool worked perfectly. - 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.
Review: I'm very pleased with this device, which seems to be more sophisticated than other similar products. - 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.

## Features

- 【voltage current display】AUTOOL car battery change memory works with any 12V DC power source, including a running starter, DC 12V lead-acid battery, or other automotive DC 12V power outlet. It displays both voltage and current, red for voltage and blue for current.
- 【Leakage Detection】Connect the protector to the full spare battery and vehicle OBD port, the screen will display current and voltage data. Unplug the fuses in the car fuse box one by one, if the current suddenly becomes low, it proves that this fuse may have leakage. Then compare the car circuit diagram, find the circuit or electrical appliance connected to this fuse, you can find out the leakage situation.
- 【Protection Function】3 amp fuse built into the memory saver, better reliable on overload protection. Detection of abnormal battery voltage and current sends an alert and the screen flashes. Current clamp anti-reverse connection protection, reverse connection after the digital tube does not light, not power.
- 【Car Memory Saver】Protect the vehicle, when replacing the car battery, it can be used to supply power to the vehicle ECU and prevent the vehicle ECU data from being lost. Note: In the process of replacing the battery, the whole process to ensure that the vehicle power off, no electrical work, to avoid generating instantaneous excessive current.
- Note: When connecting the BT30 to the vehicle's OBD port, the vehicle's main battery must be disconnected for power to be supplied.
- 【Three Years Warranty】For any quality problems. If BT30 has any defect, we will provide new replacement or solutions for our customers until satisfaction without delay, and provides lifetime technical support. For any needs, you are warmly welcomed to contact us and we will get back to you ASAP within 24 hours.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0DB8G6B1Z |
| Best Sellers Rank | #55,561 in Automotive ( See Top 100 in Automotive ) #318 in Code Readers & Scan Tools |
| Brand | AUTOOL |
| Customer Reviews | 4.2 4.2 out of 5 stars (85) |
| Date First Available | July 26, 2024 |
| Item Weight | 9.5 ounces |
| Item model number | BT30 |
| Manufacturer | AUTOOL |
| Manufacturer Part Number | BT30 |
| Model | OBD2 memory saver |
| Package Dimensions | 6.69 x 5.47 x 2.05 inches |

## Product Details

- **Automotive Fit Type:** Universal Fit
- **Brand:** AUTOOL
- **Manufacturer:** AUTOOL
- **Operating System:** Linux
- **Power Source:** Battery Powered

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/6163Z817K2L.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/71yjFBxeTBL.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/71Y+kP-e9VL.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/81PCJIrNtVL.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/71ND5mvAeUL.jpg)

## Available Options

This product comes in different **Model** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Tool worked perfectly.
*by D***D on February 28, 2026*

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, which seems to be more sophisticated than other similar products.
*by V***K on February 9, 2026*

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.

### ⭐⭐⭐⭐ Works very well
*by S***N on October 10, 2025*

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 .

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hk/products/655438123-autool-obd-ii-car-memory-saver-cable-12v-vehicle-ecu](https://www.desertcart.hk/products/655438123-autool-obd-ii-car-memory-saver-cable-12v-vehicle-ecu)

---

*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-05*