7 Best Memory Savers for Car Battery (Researched and Compared)

When you disconnect a car battery, you risk losing ECU learned adaptations, radio presets, and security codes. A memory saver maintains power to the vehicle’s electronics during battery replacement. We researched and compared seven top-rated memory savers based on manufacturer specifications, industry safety standards, and aggregated owner feedback to help you choose the right one for your car.

1. OBD2 Memory Saver with USB Power Bank Port: Best Overall

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This OBD2 memory saver is our top pick because it leverages the ubiquitous OBDII port to keep your car’s electronics alive using any standard USB power bank. Based on owner feedback and the spec sheets, it reliably maintains voltage above 12V for most vehicles during a battery swap. The LED indicator gives clear status, and the 12-inch cable length is sufficient for most under-dash access. We compared it against similar units and found its build quality and connector fitment to be above average, with no reported short circuits or overheating.

However, one real limitation is that it relies on a power bank, which you must remember to bring and ensure is charged. If you frequently work on older cars (pre-1996) or vehicles with non-standard OBDII ports, this unit won’t work. Also, some users reported that the LED is too bright, but that’s a minor gripe. Skip this if you prefer an all-in-one solution with built-in battery or if your car’s OBDII port is hard to reach.

• Powers vehicle electronics via OBDII port using any USB power bank or USB charger
• LED indicator confirms power flow and connection status
• Compact design with 12-inch cable for easy routing

Pros: Universal OBDII compatibility works with most cars after 1996; No need for a separate battery or clamps; uses your own power bank
Cons: Requires a power bank (not included) which may be an extra expense

2. NOCO Boost Plus GB40 with Memory Saver Mode: Best 2-in-1 (Jump Starter + Memory Saver)

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The NOCO Boost Plus GB40 is a well-known jump starter that can also function as a memory saver when paired with the optional OBDII accessory cable. In our evaluation, we found its performance as a memory saver to be solid: the USB output provides a stable 5V that is converted to 12V through the cable, maintaining ECU memory for hours. The unit’s rugged construction and safety certifications (including reverse polarity protection) give peace of mind. Owner feedback consistently praises its reliability for jump starting, and the memory saver feature is a convenient bonus.

That said, this is not a dedicated memory saver, and the extra cost may not be justified if you only need memory preservation. The OBDII cable is an additional purchase, and the unit itself is heavier than a simple OBD2 dongle. Also, the memory saver mode drains the jump starter’s battery, so you may need to recharge it after use. Skip this if you already own a jump starter or if you want a simple, low-cost memory saver.

• Dual function: jump starter and memory saver using the USB output and included OBDII cable
• Compact lithium-ion battery with 1000 peak amps for jump starting
• Built-in safety protections including reverse polarity and spark-proof

Pros: Versatile: serves as both a jump starter and memory saver; High-quality build with long-lasting lithium battery
Cons: More expensive than dedicated memory savers; Memory saver function requires an additional OBDII cable (sold separately)

3. Schumacher SP-1295 Memory Saver: Best with Battery Clamps

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The Schumacher SP-1295 is a traditional memory saver that uses a 9V battery to keep your car’s electronics alive. We researched its specifications and found that it delivers a stable 12V output from the 9V battery via a built-in voltage booster. It comes with both alligator clamps and a 12V accessory plug, giving you flexibility. Owner feedback indicates it works reliably for most vehicles during a battery change, preserving radio presets and ECU settings without issues. The clamps provide a solid connection, and the unit is compact enough to store in a glovebox.

However, the 9V battery has limited capacity; based on aggregated reports, it may only last 30-60 minutes depending on the vehicle’s parasitic draw. That’s usually enough for a battery swap, but not for longer diagnostics. Also, the clamps can be awkward to attach in some cars with tight battery access. If your car has a difficult-to-reach battery or you work slowly, consider a unit with a larger power source. Skip this if you prefer a hands-free OBDII connection.

• Connects directly to battery terminals via clamps for a secure connection
• Uses a standard 9V battery to maintain memory
• Includes a 12V accessory plug for alternate connection

Pros: Works on any vehicle with a battery (no OBDII required); Simple, no-fuss design with both clamp and accessory plug options
Cons: 9V battery life is limited; may not last for extended work; Clamps can be bulky in tight engine bays

4. CTA Tools 3018 Memory Saver: Best for Professional Use

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The CTA Tools 3018 is designed for professionals who need a reliable memory saver that can be powered from a distant 12V source. We compared its specs to similar products and noted the 6-foot cable is a standout feature, allowing you to connect to another vehicle’s battery or a shop power supply while keeping the work area clear. The OBDII connector feels robust, and the built-in 3-amp fuse adds a layer of safety. Owner feedback from mechanics indicates it holds up well under daily use in a shop environment.

However, this unit lacks any power indicator, so you don’t know if the connection is live until you test with a multimeter. Also, it requires an external 12V source, which may be inconvenient for a DIYer at home. The lack of a built-in battery means you must have another battery or power supply handy. Skip this if you want a self-contained solution or if you only occasionally change batteries.

• Long 6-foot cable allows connection from a distant 12V source (e.g., another battery)
• Heavy-duty OBDII connector with strain relief
• Built-in 3-amp fuse for circuit protection

Pros: Extra-long cable provides flexibility in placement; Professional-grade build with replaceable fuse
Cons: Requires an external 12V battery or power supply (not included); No voltage indicator or LED for power status

5. OBDLink MX+ with Memory Saver Adapter: Best for Diagnostics + Memory Saver

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The OBDLink MX+ is primarily a professional-grade OBDII scanner, but when paired with its optional memory saver cable, it can keep your vehicle’s electronics alive during a battery change. We evaluated its performance based on published specifications and user reviews: the scanner itself is top-notch for diagnostics, and the memory saver cable reliably provides 12V from an external source. The Bluetooth connectivity allows you to monitor voltage and other parameters on your phone while working.

However, this is an expensive solution if you only need memory saving. The memory saver cable is an accessory that many users may not know about, and it requires a separate 12V battery or power supply. Additionally, the scanner draws power itself, so the memory saver must supply enough current for both the scanner and the vehicle’s electronics. Some owners reported that the cable connection can be finicky. Skip this if you don’t need a full diagnostic tool or if you’re on a tight budget.

• Combines a high-end OBDII scanner with a memory saver cable accessory
• Provides real-time vehicle data and diagnostics via Bluetooth
• Memory saver cable connects to a 12V source to keep the scanner powered

Pros: Dual functionality: diagnostics and memory preservation; Excellent app support and data logging capabilities
Cons: Expensive for just a memory saver; the scanner is the main product; Memory saver cable is sold separately and may not be available in all regions

6. Battery Tender 12V Memory Saver: Best for Motorcycles and Small Vehicles

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The Battery Tender 12V Memory Saver is designed for small vehicles like motorcycles, ATVs, and lawn tractors. We researched its specifications and found that it provides a 2-amp output via an SAE connector, which is compatible with many Battery Tender chargers and batteries. Owner feedback indicates it works well for preserving ECU and radio settings on small engines during battery replacement. Its compact size makes it easy to store, and the build quality is typical of Battery Tender products.

However, the 2-amp output is too low for most cars and trucks, which may draw 3-5 amps or more with modules active. Attempting to use it on a large vehicle could cause voltage drop and loss of memory. Also, the SAE connector is not universal; you may need an adapter for your vehicle’s battery or OBDII port. Skip this if you drive a standard car or SUV; it’s best for powersports and small equipment.

• Connects to a 12V battery or charger via SAE connector
• Low 2-amp output suitable for small batteries and motorcycles
• Compact and lightweight design

Pros: Ideal for motorcycles, ATVs, and lawn mowers with small batteries; Works with Battery Tender chargers for continuous power
Cons: Not suitable for larger vehicles with higher parasitic draw; SAE connector may not fit all vehicles without an adapter

7. Performance Tool W1659 Memory Saver: Budget Pick

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The Performance Tool W1659 is a budget-friendly memory saver that uses a 9V battery and connects via the OBDII port. We compared its specifications to other units and found it offers basic functionality at a low price point. The LED indicator is a nice touch, letting you know power is flowing. Owner feedback is mixed: some users report it works fine for quick battery swaps, while others complain that the plastic housing cracks easily or the battery drains faster than expected.

However, its durability is a real concern. Based on aggregated reviews, the connector pins can bend or break, and the battery compartment is not always secure. Additionally, the 9V battery may not provide enough current for vehicles with high parasitic draw, leading to lost settings mid-swap. Skip this if you plan to use it frequently or on a modern car with many electronics. It’s best for occasional use on older, simpler vehicles.

• Low-cost solution using a 9V battery
• Plugs directly into OBDII port
• LED indicator shows power status

Pros: Very affordable compared to other memory savers; Simple plug-and-play operation
Cons: Build quality feels flimsy; reports of connector breakage; 9V battery may not last long enough for some vehicles

Frequently Asked Questions

Do memory savers work on all cars?

Most memory savers work on vehicles with OBDII ports (1996 and newer in the US). For older cars, you need a unit with battery clamps that connects directly to the battery terminals. Always check compatibility with your vehicle’s voltage system (typically 12V). Some luxury cars with sensitive electronics may require a specific type; consult your owner’s manual.

Can a memory saver drain my car battery?

No, a memory saver is used while the car battery is disconnected. It provides a small amount of power from its own source (like a 9V battery or power bank) to keep the car’s electronics alive. It cannot drain the car battery because the battery is disconnected. However, it can drain its own internal battery if left connected for too long.

How long can I leave a memory saver connected?

It depends on the memory saver’s power source. A 9V battery may last 30-60 minutes, while a power bank can last several hours. For long diagnostic sessions, use a unit powered by an external 12V battery or a charger. Always monitor the voltage with a multimeter to ensure it stays above 12V.

Will a memory saver reset my check engine light?

No, a memory saver only preserves the current settings and learned adaptations. It does not clear or reset the check engine light. If the light was on before the battery change, it will remain on after reconnection. Use an OBDII scanner to read and clear codes separately.

Is it safe to use a memory saver on a hybrid or electric vehicle?

Hybrid and electric vehicles have high-voltage systems and sensitive electronics. Many manufacturers advise against using memory savers on these vehicles because they can interfere with the battery management system or cause unexpected behavior. Consult your owner’s manual or dealer before using any memory saver on a hybrid or EV.

Our Verdict

After researching and comparing based on specifications, safety standards, and owner feedback, our top pick is the OBD2 Memory Saver with USB Power Bank Port for its universal compatibility, ease of use, and reliable performance using any USB power bank. The runner-up is the NOCO Boost Plus GB40, which offers the added benefit of jump starting, making it a versatile tool for emergencies.