9 Best Memory Saver for Car Battery Reviews

You’ve just replaced your car battery, only to find that your radio needs a security code, your power windows forget their positions, and your check engine light comes on. It’s a frustrating experience that many drivers face when they lose power to the onboard computer. That’s where a memory saver for car battery comes in—a simple tool that keeps your vehicle’s electronic systems alive while you swap out the old battery.

In this guide, we’ll walk you through nine of the best memory savers on the market, explaining how each one works and which situations they’re best suited for. Whether you’re a DIY enthusiast or a professional mechanic, you’ll find the perfect device to preserve your car’s settings and avoid the headache of reprogramming.

VSTM OBD II Memory Saver – Gold-Plated Contacts & 10ft Cable

If you’ve ever struggled to reach a second car’s 12V outlet while changing your battery, the VSTM memory saver’s 10-foot cable is a game changer. Most memory savers come with a short 3–5 foot cord, but this one gives you plenty of slack to connect to another vehicle’s cigarette lighter or even a jump starter sitting on the ground. The gold-plated OBD pins are a nice upgrade over the usual zinc plating—they resist corrosion and provide a more reliable electrical connection, which is critical when you’re relying on a backup power source.

Built-in overload protection comes in the form of an 8A fast-blow fuse that trips within 0.1 seconds if the current or voltage exceeds safe limits. This protects both your vehicle’s ECU and the memory saver itself. The unit includes both a cigarette lighter plug and alligator clips, so you can power it from any 12V DC source, including another car, a jump starter, or a spare battery. It’s a versatile solution for anyone who wants the flexibility to use a distant power source without worrying about data loss.

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• Compared by most of OBD metal pins in market with zinc plating, ours are gold plating. Better reliable on contact and electric transmission. Compared by most of OBD II Memory Saver (or Automotive Computer Memory Saver) in market with 3 ~ 5 ft in cable length, ours with super long 10 ft (3meters) cable. In this way, you can change your car battery, also by get the alternative 12V power source from another car, when you not have a jump starter on hand
• About Overload Protection: This product is built with an 8A fast-blow fuse. When the input current exceeds 8A or the voltage exceeds 14V, the fuse will blow within 0.1 seconds to cut off the circuit, protecting the wire and vehicle ECU. Powered by any jump starter with a 12V outlet into an OBD II Memory Saver. Interface connector between a 12V DC power source and vehicle's OBD II port. Preserves vehicle codes and electronic presets. Replacing a car battery on older vehicles used to be simple!! You unhook the old battery and install the new one.
• Late-model vehicles, however, rely on computers that operate everything from the stereo to the transmission. If power is lost to the computer, the settings are lost and have to reset to default. That means the vehicle may feel different when driven, and you may have to enter a security code to access the stereo.
• Using this simple memory saving device when replacing your car battery will help you avoid these problems. This device can work with any 12V DC power source, including jump starter, DC 12V Lead-acid battery, or another car’s DC 12V power outlet.
• As our device with 3 meter cable, it will be a convenient way, should you not have jump starter (or Lead-acid battery) on hand, and the device can also get the 12v power supply from cigarette lighter of another good car. Just insert the Cigarette lighter plug to this car and insert into 16 pin plug to the OBD port of the car you want to replace battery. You can replace the battery.
• The OBD II Vehicle ECU Emergency Power Supply Cable Memory Saver features exceptional wire safety with its 6AWG pure copper construction. This high-quality wiring delivers current-carrying capacity that far surpasses the product's normal operating current range of 1-5A, while easily withstanding instantaneous current fluctuations up to 15A. This robust design effectively prevents wire melting caused by overload, ensuring reliable and safe power transmission to protect your vehicle's electronic systems during battery replacement.

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YUANTUO 9V Battery Powered Memory Saver – Simple & Portable

Sometimes you just want a no-fuss tool that doesn’t require a second car or a jump starter. The YUANTUO memory saver runs on a single 9V battery (not included), so you can keep your car’s settings alive without any external power source. Just plug it into the OBD II port, and it maintains power to the ECU, radio, and other memory-dependent systems while you swap the battery. It’s incredibly compact and fits easily into your glove box for emergencies.

Keep in mind that a 9V battery won’t power the vehicle’s systems indefinitely—it’s designed for short battery changes, typically lasting 30 minutes to an hour. The device is made from high-quality materials and has a long service life, though you’ll need to replace the 9V battery periodically. It’s best for quick battery swaps where you don’t want to drag out extension cords or another vehicle. For DIYers who want simplicity, this is a solid pick.

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• Compatible: Battery memory saver fit for all OBD ll 16-Pin interface.
• Function: Maintains power to vehicle electronic systems and memory when the vehicle battery is disconnected or replaced. This device ensures that critical settings and data in the vehicle's systems are not lost.
• Advantages: Car memory saver allows for a seamless battery replacement or maintenance process without the need to reprogram or reset vehicle systems, ensuring critical vehicle data is not lost during the battery replacement process. This helps maintain optimal vehicle performance.
• Product: Package does not contain 9V battery. The product is made of high-quality materials and has a long service life.
• Installation: Connect the memory protection connector to the 9V battery and plug into the 16-pin OBD2 port in the vehicle.

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All-Sun GK504 Automotive Setting Keeper – Cigarette Lighter Plug Ease

For vehicles that still have a 12V cigarette lighter port, the All-Sun GK504 offers a straightforward way to preserve memory without needing to access the OBD II port directly. This memory saver plugs into your car’s lighter socket and provides power to the onboard computer through a rugged cable. The hard plastic body is built to withstand the occasional drop or tug, and the cable is designed for durability—no flimsy wires here.

One thing to note: this device doesn’t include an OBD II connector, so it relies entirely on the cigarette lighter port for power. If your car’s lighter port is live when the ignition is off, you’re good to go. But if your vehicle kills power to the lighter when the battery is disconnected, the All-Sun won’t work. In that case, you’d need to use a different method. However, for many older cars, this is a convenient and reliable option that saves you from crawling under the dashboard.

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• Ruggedly designed hard plastic body
• Offering a convenient, easy way to save memory data of on-board computers
• Featuring convenient ability to plug into any vehicle cigarette lighter
• Includes a rugged cable designed for durability
• Requires 9-volt Alkaline battery (not included)

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Autel MaxiBAS BTMS Memory Saver – Professional Voltage Display & Reverse Protection

Autel is well-known for automotive diagnostic tools, and the MaxiBAS BTMS brings that expertise to memory savers. This device features a built-in voltmeter that lets you check your backup battery’s voltage before you start—so you know it has enough juice to keep the car’s systems alive. The two battery clips (red/black) connect to any 12V backup battery, and the OBD II connector plugs into your vehicle’s port. Polarity reverse protection is a standout feature: if you accidentally swap the clips, the unit stops the flow of electrons, preventing damage to both the memory saver and your car’s electronics.

This is a professional-grade tool designed for auto repair shops, garages, and serious DIYers. It’s compatible with all 12V OBD II vehicles from 1996 onward. The built-in surge protection also helps maintain stable power during the battery swap, reducing the risk of data corruption. If you frequently replace batteries or work on multiple cars, the Autel’s durability and safety features make it a worthwhile investment. Note that it does not include a backup battery—you’ll need to supply your own 12V source.

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• ✅【2026 Autel Car Memory Saver】 2026 Autel Flagship MaxiBAS BTMS battery tester memory saver is a professional vehicle data protector. It can retain vehicle codes and electronic presets, and prev.ent information loss when the onboard com.puter is powered off. This exclusive battery clamp can be connected to a 12V backup battery to ensure that not outage when replacing battery. This professional battery tester memory protector is an indispensable product for auto repair shop, garages, mechanician. Note: For any issues experienced after purchase or need explore [additional accessory], please reach out to: 📞auteldirect@ outlook. com🛣️.
• ✅【Preserve Vehicle Settings During Battery Replacement】When replacing, disconnecting or removing car battery without a backup power supply, there will be many problems. Not only may the various memories of the car be lost, but it also cause display abnorm.alities. Such as Throttle corr.ection data is lost, the window one-button lifting and lowering fa.ils, the window position signal saved in the control unit is lost, and the control unit cannot deter.mine the specific position of the curr.ent glass. Our OBDII memory saver allows you to keep the power on when replacing the battery. Directly connect to the 12V backup battery without worrying about data loss.
• ✅【Compatible with All 12V Vehicles, with 2 Battery Clips】Autel Car battery memory saver is available for All OBDII 12V vehicles from 1996 and later. One end of this OBD II memory protector is the OBD2 standard interface, which is compatible with 99% of vehicles on the market. Another port of this OBDII data saver is two battery clips, which can be clipped to the positive and negative poles of the backup battery. The red clip is connected to the positive pole and the black clip is connected to the negative pole.
• ✅【Built-in Voltmeter, Polarity Reverse Protection】This car battery memory save features a built-in voltmeter, allowing you to quickly test the backup battery's voltage before replacing it, ensuring a safe and effective replacement process. It can also detects reverse polarity. If the polarity is reversed, the BTMS stops the flow of electrons, preventing damage to the battery and vehicle electronics.
• ✅【Battery Replacement Procedures】Only 4 steps to save memory data and change battery. Step 1: Test backup battery, all three LED light green if the battery has sufficient voltage or at least 10 volts. Step 2: Powered off the vehicle. Step 3: Plug the cable into vehicle obd2 port, two LED light green when connected successfully. Step 4: Detach, remove or replace the existing vehicle battery, Start work. Vehicle information Memory data will never be lo.st.
• ✅【LED Indicator Light】The 2026 new version Autel memory preserver has 3 indicator lights.Connect the OBD socket of the tool to the OBD interface of the vehicle, and then connect the clip to the backup battery. 2 green lights will light up, indicating that the connection is successful; 3 green lights will light up, indicating that the battery voltage is greater than 10V; 3 red lights will light up, and the battery voltage is less than 10V.
• ✅【Surge Protection, 1-Year Warra-nty】This Autel MaxiBAS BTMS OBDII Battery Tester Memory Saver has surge protection and has 3PCS LEDs to indicate the power status. It comes with 1-Year Warranty and 30-day Worry-Free Return and Replacement Policy. If you have any questions, you can contact us via Amazon message or via:💌auteldirect@ outlook. com💌. We are always here to ensure that you have no worries.

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Snlazp 10ft OBD II Memory Saver – Long Cable with Alligator Clips

Similar to the VSTM, the Snlazp memory saver offers a 10-foot cable that gives you plenty of reach when connecting to a backup battery or another car. The kit includes a cigarette lighter plug and alligator clips, so you can power it from a jump starter, a spare battery, or even a friend’s car. The 8A fuse provides overload protection, and the OBD II connector is compatible with all 1996 and newer vehicles. Many users appreciate that they can keep their radio presets, seat memory, and engine tuning intact without any hassle.

One difference from the VSTM is that the Snlazp uses standard metal pins rather than gold-plated ones. This doesn’t affect performance for most users, but if you live in a humid area, corrosion might be a concern over time. The cable is well-insulated and flexible, making it easy to route through a window or door. It’s a solid, no-frills option for anyone who needs a long reach without spending extra on premium contacts.

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• Super Long 10ft (3meters) Cable: plenty long until you try connecting it to another car's battery or cigarette lighter. In this way, you can change your car battery, also by get the alternative 12V power source from another car, when you not have a jump starter on hand.
• Cigarette Lighter with Alligator to OBD2 16 Pin Male Connector Power Cable :Powered by any jump starter with a 12V outlet into an OBD II Memory Saver.Plug it into the OBD Male connector of the vehicle, plugging the cigarette connector into the clip cords, hooking it up to a 12V battery source.Note:This device can work with any 12V DC power source, including jump starter, DC 12V Lead-acid battery, or another car’s DC 12V power outlet.
• 8 amp fuse built into the memory saver, better reliable on overload protection. Powered by any jump starter with a 12V outlet into an OBD II Memory Saver. Interface connector between a 12V DC power source and vehicle's OBD II port. Preserves vehicle codes and electronic presets. Replacing a car battery on older vehicles used to be simple!! You unhook the old battery and install the new one.
• Work no problem as all ODBII ports :It works on any vehicle with OBDII which is 1996 and later (You will be plugging one end into it). It is not needed or required to change your battery. It is used to keep the memory of you radio setting and other memory computer controlled devices on the vehicle (EMCU for example.) It is used as a convenience as to not erase the memory.
• Easy to Replace :Should you not have jump starter (or Lead-acid battery) on hand, and the device can also get the 12v power supply from cigarette lighter of another good car. Just insert the Cigarette lighter plug to this car and insert into 16 pin plug to the OBD port of the car you want to replace battery.

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EZRED MS4000 Automotive Memory Saver – All-in-One with Built-In Battery

What if you could have a memory saver that doesn’t require a second vehicle or a jump starter? The EZRED MS4000 comes with a built-in 12V, 4.5 amp-hour sealed lead-acid battery, so it’s a complete standalone solution. Just plug the OBD II connector into your car’s port, and the internal battery takes over, preserving all your drive-ability codes, radio settings, keyless entry data, and more. The unit is protected by a 4 amp circuit breaker, which resets automatically after a fault.

This all-in-one design is incredibly convenient—you don’t need to hunt for a backup battery or worry about cables reaching another car. The MS4000 also doubles as a charger for the internal battery, so it’s always ready when you need it. The downside is that the internal battery has a limited capacity; it can power the vehicle’s memory for about 30–60 minutes, depending on the load. For most battery swaps, that’s plenty of time. It’s a bit heavier than other memory savers, but the convenience is unmatched for home garages and occasional use.

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• Memory saver & charger: The MS4000 saves all drive-ability codes & settings when disconnecting/changing a vehicle's starter battery. It also protects settings & codes for anti-theft radios, clocks, keyless entry systems & much more.
• Charges batteries: A 12 volt, 4.5 amp hour sealed lead acid battery is included inside the unit. The direct wired OBDII connector plugs directly into the vehicles OBDII port.
• Protects & saves: This unit is protected by a 4 amp circuit breaker & can be used for anti-theft radios, clocks, keyless entry systems, alarms, cell phone settings, GPS Memory, TPMS & other memory-related functions.
• Innovation at its finest: We make high quality hand tools & accessories, tool organizers, ratchet sets, LED flashlights & work lights. We specialize in tools for battery, heating & electrical work, for both the professional tradesperson and home DIY'er!

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JEUCLEL USB Powered Memory Saver – Power Bank Compatible with Buzzer Alerts

If you already own a USB power bank, the JEUCLEL memory saver lets you leverage that for battery changes. Instead of alligator clips or a cigarette lighter, you simply plug a USB power bank into the device, and it supplies power to your car’s OBD II port. This is incredibly convenient because power banks are common, portable, and can provide several hours of backup. The unit also features three indicator lights and a buzzer that sounds when the USB power is low, so you won’t accidentally lose power mid-swap.

The buzzer is a thoughtful addition: you can place the memory saver inside the cabin and focus on the battery swap under the hood. If the power dips, the alarm alerts you, saving you from walking back to check the lights. The device is compact and easy to store. However, note that some power banks may not output enough current to keep all modules alive—especially on newer cars with high parasitic draw. It’s best to use a power bank with at least 2A output. Overall, this is a modern, innovative solution for tech-savvy drivers.

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• 【Memory Saver】 Protect memory during car battery change, prevent reset settings, such as car dashboard information, digital clock, stereo, memory seats, ABS, etc.
• 【Danger of Power Outage】 Replacing the car battery when there is no backup power supply may not only lose various memories of the car, but may also cause display abnormalities. In addition, the restoration may require readjustment at the dealer. With this tool, you don't have to worry about that.
• 【USB Powered】 The memory protector works with USB power supply. Only a USB mobile power supply with sufficient power is needed to perfectly complete the task of replacing the battery. Compared with similar products that use alligator clips to connect to the backup power supply, it is more stable, more convenient, and greatly reduces the difficulty of operation.
• 【Indicators and Buzzer】The new version of the memory retention period has 3 indicators and 1 buzzer, which can give warnings in many situations. Memory Saver operates in the cab, and battery replacement must be done in front of the vehicle. The buzzer will remind you when the USB power is low, so you can concentrate on your work.
• 【Quality】 This tool is made of new PVC material, eco-friendly material, non-toxic and tasteless. High quality can be guaranteed and a longer service life can be ensured.

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Apopip Memory Saver for Car Battery – Simple Plug-and-Play via 12V Receptacle

Sometimes the simplest solution is the best. The Apopip memory saver plugs directly into your vehicle’s 12V power receptacle (cigarette lighter) and keeps your onboard computer and settings alive while you change the battery. It’s a straightforward device with no extra cables, clips, or batteries—just a compact plug-in unit. The design is minimal, and it works with any 12V vehicle. It saves all drive-ability codes, clock settings, radio presets, and keyless entry data.

Because it relies on the cigarette lighter socket, you need to ensure that your vehicle’s lighter port remains powered when the battery is disconnected. Many modern cars keep the lighter live for a few minutes after the ignition is off, but some may cut power immediately. The Apopip is best suited for older cars or those with a constant 12V lighter circuit. It’s a very affordable option, but it lacks the versatility of OBD II-connected memory savers. For a fast, no-frills battery swap, it gets the job done.

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• Saves all drive-ability codes and settings changing a vehicle's starter battery.
• It also protects codes and settings for clocks, key less entry systems, and so on.
• Plugs into vehicle's 12 volt power receptacle.
• This is the best way to change out your vehicles battery. All learned data is saved. Saves memory in you vehicle.
• Just make sure the 9V battery is new, turn off your door lamp and other lighting system inside your car to off, attach this item to a 9V battery, insert it into cig receptacle, turn the ignition and your ready to replace your battery. Finished in 15 minutes.

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AUTOOL OBD II Memory Saver with Digital Display & Leakage Detection

The AUTOOL memory saver stands out with its digital display that shows both voltage and current—red for voltage, blue for current. This lets you monitor the backup battery’s health and the load from your vehicle’s systems in real time. But the real bonus is its leakage detection function: while connected, you can pull fuses one by one from the car’s fuse box. When the current suddenly drops, you’ve found a circuit that may be leaking power. This is a handy diagnostic tool for anyone who suspects a parasitic drain.

The unit includes a 3A fuse for overload protection, and the current clamp has reverse-connection protection—if you hook it up backwards, the display simply stays off, preventing damage. It works with any 12V DC source. However, note that during battery replacement, you should ensure no electrical accessories are turned on to avoid an instantaneous current surge. The digital display adds a layer of professionalism, making this a great choice for DIYers who also want to troubleshoot electrical issues.

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• 【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 a load to be present. If the vehicle’s main battery is charged and remains connected, power will not be drawn from the current circuit, and no current will flow.
• 【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.

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Buyer’s Guide: What to Consider

Choosing the right memory saver for your car battery involves understanding a few key factors. Not all memory savers work the same way, and the best one for you depends on your vehicle, your tools, and how often you plan to use it. Here are the most important features to consider before making a purchase.

• Power Source Type: Consider how you’ll power the memory saver. Options include OBD II connection with alligator clips to a backup battery, cigarette lighter plug, USB power bank, 9V battery, or a built-in rechargeable battery. Your choice depends on what you have available and your vehicle’s layout.
• Cable Length: A longer cable (e.g., 10 feet) lets you place the backup battery or jump starter far from the vehicle, which is useful when working in tight spaces or using another car’s power. Shorter cables are fine if you have a nearby power source.
• Overload Protection: Look for a built-in fuse (usually 3A, 4A, or 8A) or circuit breaker that protects your vehicle’s ECU and the memory saver from excessive current. Some models also include polarity reverse protection, which is a valuable safety feature.
• Vehicle Compatibility: Most memory savers work with all OBD II 16-pin vehicles from 1996 onward. However, some models that plug into the cigarette lighter may not work if your car cuts power to that port when the battery is disconnected. Always check your vehicle’s behavior.
• Additional Features: Extra features like a voltmeter, digital display, buzzer alerts, or leakage detection can add convenience and diagnostic capability. Decide if you need these or prefer a simple, no-frills device.
• Build Quality & Durability: Look for rugged construction, gold-plated or corrosion-resistant contacts, and durable cables. If you’ll use the memory saver frequently, invest in a model that can withstand repeated use without failing.
• Portability & Storage: If you want to keep the memory saver in your glove box, consider its size and whether it comes with a carrying case. Compact models like the 9V battery version are easy to store, while all-in-one units with built-in batteries are bulkier.

Conclusion

Whether you’re a weekend DIYer or a professional mechanic, a memory saver for car battery can save you from the frustration of lost settings, security codes, and drivability issues. From the long-reach VSTM and Snlazp cables to the self-contained EZRED MS4000 and the innovative USB-powered JEUCLEL, there’s a memory saver for every budget and situation.

For most drivers, the Autel MaxiBAS BTMS offers the best balance of professional features and safety, while the YUANTUO 9V model is perfect for quick, portable swaps. If you’re looking for added diagnostic functionality, the AUTOOL with its digital display and leakage detection is a standout. No matter which you choose, you’ll protect your car’s electronics and enjoy a smoother battery replacement process.