Best Memory Saver For Car Battery: Compare 10 Options

#1 · Best Overall

1. VSTM OBD II Cable

• Weight: 10.6 oz

Best for: Long-reach OBD cable users.

Why it ranks #1: Its 10-foot cable allows extra reach, and the listing specifies gold-plated OBD pins and reverse-polarity protection for a 12V backup setup.

A 10-foot cable is the VSTM VST-939’s clearest advantage, giving battery-service work more reach than a short lead. Gold-plated OBD pins are specified for contact and oxidation resistance, while the cable connects a 12V power source to the vehicle’s OBD II interface to preserve codes and electronic presets during battery replacement.

The 3-meter cable can provide more working distance between the vehicle and a backup source, and the listing says a working car’s cigarette-lighter plug can serve when a jump starter or lead-acid battery is unavailable. Gold-plated pins are presented as supporting stable electrical transmission through the OBD connection. Reverse-polarity protection is also specified to guard against incorrect connection. This setup suits buyers who want reach and a listed alternative power arrangement, while still requiring a 12V source.

Skip it if you want voltage and current shown during service; the MR CARTOOL B80 lists a real-time voltage and current display.

Choose the VSTM VST-939 if extra cable reach and the listed working-car power option suit your battery-service setup. It still needs a 12V source, so plan where that source will sit before connecting the OBD lead.

Listed on Amazon as: VSTM OBD II ECU Memory Saver Cable,12V Emergency Power for Car Battery Swap

#2 · Best Display

2. MR CARTOOL B80

• Weight: 0.28 kg

Best for: Live-voltage display seekers.

Why it ranks #2: The OBD2 cable has a real-time voltage and current display, plus a stated 10-volt minimum operating voltage and 24-month warranty.

A real-time voltage and current display distinguishes the MR CARTOOL B80, helping users monitor the connected power during battery replacement. Its OBD2 cable connects a spare battery to the vehicle interface to prevent loss of operating data, while the listed 10-volt minimum operating voltage gives buyers a clear threshold to consider.

The B80’s display reports voltage and current during replacement, giving users information about the backup supply while they work. Its OBD2 interface is specified for compatible vehicles, and the product description says to connect a spare battery through the cable to maintain operating data. These features support a monitored battery-change workflow rather than an unobserved connection. The stated minimum operating voltage is 10 volts, a practical limit users should account for when selecting and checking the power source.

Skip it if you need extra cable reach stated in the listing; the VSTM VST-939 specifies a 10-foot cable.

The MR CARTOOL B80 suits battery-service users who value voltage and current visibility while connecting a spare battery through OBD2. Its 10-volt minimum operating threshold is an important boundary when choosing the backup source.

Listed on Amazon as: MR CARTOOL OBD2 Car Memory Saver Cable with Voltage/Current Display

#3 · Best 12V Connector

3. Clore SOLAR ESA30

• Weight: 5.6 oz

Best for: Portable 12V-source users.

Why it ranks #3: This OBD II connector accepts a 12V power supply, such as a portable jump starter, and passes power through the vehicle’s OBD connection.

Using any 12-volt power supply, including a portable jump starter, is the SOLAR ESA30 connector’s defining flexibility. It plugs into the vehicle’s OBD II port and routes power through that connection to help save memory during battery disconnection, making it a simple connector option for buyers who already have a suitable source.

The OBD II plug connects the ESA30 to the vehicle, and the listing explains that the electrical system receives power through this connection. Pairing it with any 12-volt supply, such as a portable jump starter, gives buyers flexibility to use a power source they already have during battery work. The product is described as a memory-saver connector, rather than a complete power supply. This distinction matters for planning: users need the compatible 12V source alongside the connector.

Skip it if you want USB power from a power bank with status alerts; JEUCLEL JEUS158 lists USB power, LEDs, and a speaker.

The Clore Automotive SOLAR ESA30 suits users who already have a 12V source and want an OBD II connector to supply vehicle memory during battery disconnection. Remember that the connector itself is not the power supply.

Listed on Amazon as: Clore Automotive SOLAR ESA30 OBD II Memory Saver Connector

#4 · Best USB Option

4. JEUCLEL USB Connector

• Weight: 0.13 kg

Best for: USB power-bank operators.

Why it ranks #4: USB power lets buyers connect a power bank, while three LED indicators and a speaker signal device status; the listing states a one-year warranty.

USB power-bank operation is the JEUCLEL JEUS158’s defining convenience, giving users a way to power an OBD II memory saver from a portable USB source. Three status LEDs and a speaker indicate device states, helping users follow its operation while protecting vehicle settings during a battery change.

The USB input lets users connect a power bank, which the listing describes as a convenient way to provide stable operation. At the vehicle end, the OBD II connector is intended to preserve dashboard information, clock, stereo, memory-seat, and ABS settings during battery replacement. Three marked LEDs work with the speaker to indicate different device statuses, providing operational cues while connected. This combination suits users with a USB power bank who want both a portable supply and audible or visual status indications.

Skip it if you want a connector for any 12V supply instead of USB power; the Clore Automotive SOLAR ESA30 lists that arrangement.

The JEUCLEL JEUS158 fits buyers who have a USB power bank and value LED and speaker status cues during battery replacement. Its USB power workflow is the key fit consideration when selecting a supply.

Listed on Amazon as: USB Powered Vehicle OBD II Connector Memory Saver with Buzzer

#5 · Best Cigarette Plug

5. allsun GK504

• Weight: 2.39 oz

Best for: Rugged cigarette-lighter setup.

Why it ranks #5: Its rugged cable and hard-plastic body connect through a vehicle cigarette lighter, and the listing says it requires a separate 9V alkaline battery.

A rugged hard-plastic body and cigarette-lighter connection make the allsun GK504 a practical choice for buyers who prefer a vehicle power-receptacle workflow. It is intended to preserve onboard-computer memory, including radio presets, clock settings, seat memory, and anti-theft codes, while the battery is disconnected for replacement.

The cigarette-lighter plug gives this setting keeper a familiar connection point, while its rugged cable and hard-plastic body are specified for durability during use. The listing says it can preserve radio presets, clock settings, seat memory, and anti-theft codes, which can spare users from restoring those settings after battery work. It also requires a 9-volt alkaline battery, which is not included, so users need to obtain that battery separately before relying on the memory-saving setup.

Skip it if you need a 9V battery included; the YUANTUO f1b31690-17de-417d-a47d-e6f9e7decd5d listing specifies a 9-volt input instead.

The allsun GK504 suits buyers who want a cigarette-lighter connection and memory retention for everyday vehicle settings during battery changes. Its 9-volt alkaline battery is not included, so have one ready before beginning the job.

Listed on Amazon as: All-Sun GK504 Automotive Setting Keeper Auto Vehicle Computer Memory Saver, 1 Pack

#6

6. Autel MaxiBAS BTMS

• Weight: 100 g

Best for: 12V backup-battery users.

Why it ranks #6: The listed battery clamp connects to a 12V backup battery, and the product includes the MaxiBAS BTMS and accessories with a one-year warranty.

A dedicated battery clamp lets the Autel MaxiBAS BTMS connect a 12V backup battery during replacement, giving vehicle electronics continued power. Its OBD2 memory-saver role is specified for retaining vehicle codes and electronic presets when onboard-computer power is interrupted, making the backup-battery workflow its defining feature for 12V vehicle service.

The clamp connection to a 12V backup battery provides a stated power path during battery replacement, while the OBD2 memory-saver function addresses retaining codes and electronic presets. Together, these features suit users who have a backup battery available and want to connect it as part of the replacement workflow. The listing identifies compatibility with all 12V vehicles, but this does not establish support for vehicles outside that voltage category. The package is described as MaxiBAS BTMS and accessories.

Skip it if you service a vehicle outside the stated 12V category; the YUANTUO unit lists OBD II 16-pin interface compatibility.

The Autel MaxiBAS BTMS fits buyers with a 12V backup battery who want an OBD2 connection for battery replacement and data retention. Its stated fit is for 12V vehicles, so check that voltage category against the vehicle being serviced.

Listed on Amazon as: 2026 Autel MaxiBAS BTMS OBD2 Memory Saver, for All 12V Vehicles

#7

7. MR CARTOOL E60

Best for: Emergency-power cable buyers.

Why it ranks #7: This is specifically listed as an OBDII vehicle emergency power cable and includes a cable, but the supplied details do not state its power source or length.

An OBDII vehicle emergency power supply cable gives battery-service buyers a cable-based memory-saving option. The MR CARTOOL E60 is identified as an OBDII vehicle emergency power supply cable, positioning it for preserving vehicle power during battery work. The supplied listing confirms the model and cable component, but gives few further operating details.

The E60 title specifies both an OBDII connection and emergency power supply, indicating a route for maintaining vehicle power during battery service. Its included component is listed as a cable, so buyers can identify what arrives without assuming a backup battery is included. The listing does not state cable length, power-source requirements, or detailed setup steps; those unspecified details limit how precisely users can plan their workspace or confirm their preferred power arrangement in advance.

Skip it if you need a stated cable length, backup-power source, or detailed setup guidance; the VSTM VST-939 lists a 10-foot cable.

The MR CARTOOL E60 suits buyers seeking a plainly identified OBDII emergency-power cable for battery service. Its listing leaves cable length and power-source details unspecified, so it is a limited fit when those setup particulars need to be known beforehand.

Listed on Amazon as: MRCARTOOL E60 OBDII Vehicle Emergency Power Supply Cable Car Memory Saver

#8

8. YUANTUO 9V Saver

• Weight: 1.76 oz

Best for: 9V OBD II users.

Why it ranks #8: It is described for vehicles with an OBD II 16-pin interface and 9V input, making its stated power arrangement clear but limiting its compatibility claim.

A 9V input and plug-and-play OBD II connection define this YUANTUO memory saver, providing a straightforward way to maintain vehicle-system memory while the main battery is disconnected. The listing specifies a 16-pin interface and says it retains settings and data, aiming to avoid reprogramming or resetting after battery replacement.

The 16-pin OBD II interface is listed as compatible with vehicles using that port, and the plug-and-play description points to a direct connection rather than a more elaborate installation. Its 9-volt input supplies the stated power basis for maintaining memory while the vehicle battery is disconnected. The listing says this can preserve critical settings and data during replacement, reducing the need to reprogram or reset systems afterward. Buyers need to have the required 9V supply available for the setup.

Skip it if you want to power memory saving from a working car’s cigarette-lighter plug; the VSTM VST-939 lists that option.

This YUANTUO unit suits owners whose vehicle has the specified OBD II 16-pin port and who want a 9V-powered memory saver for battery work. Port compatibility is the key boundary, so it is not the pick for a different interface.

Listed on Amazon as: 9V Battery Powered Memory Saver for Car Battery Fit for All OBD ll 16-Pin Interface

#9

9. OCHIKI 9V Saver

Best for: Short-term 9V OBD users.

Why it ranks #9: This OBD2 adapter is described as using a 9V battery for short-term backup power, though the listing provides fewer connection and safety details.

A 9V battery used as backup power is the OCHIKI memory saver’s stated approach to supplying a trip computer during battery replacement. Its listing identifies an OBD II 16-pin interface and describes short-term power for settings storage, giving buyers a compact-scope option for a brief battery disconnect workflow.

The OBD II 16-pin interface provides the specified vehicle connection, while a 9V battery can serve as backup power for the trip computer. The listing describes this as short-term power during battery replacement, which helps define the intended scope: a brief service interval rather than an extended power arrangement. Buyers considering it should match the stated 16-pin port and prepare the 9V backup battery for the job. The supplied information does not specify a runtime beyond the short-term description.

Skip it if you need real-time voltage and current monitoring; the MR CARTOOL B80 lists both display readings.

The OCHIKI memory saver suits buyers with an OBD II 16-pin vehicle seeking 9V backup power for a short battery replacement. Its stated short-term scope is the boundary to weigh for longer service work.

Listed on Amazon as: 9V Battery Powered Memory Saver for Car Battery Fit for All OBD ll 16-Pin Interface Vehicles, OBD2 Adapter Connector for Short Disconnect Settings Storage

#10

10. Apopip OBD11 Saver

Best for: Cigarette-receptacle memory keepers.

Why it ranks #10: It requires a separate 9V alkaline battery and plugs into a 12-volt power receptacle, but its listing gives limited compatibility and operating details.

A 12-volt power-receptacle plug is the Apopip OBD11’s defining connection, providing a familiar route for preserving onboard-computer settings during a starter-battery change. The listing says it saves driveability codes, clock and keyless-entry settings, and other learned data; it also requires a 9V alkaline battery, which is not included.

The product description identifies the vehicle’s 12-volt power receptacle as its plug-in point and says the device preserves driveability codes and settings as the starter battery is changed. It specifically names clocks and keyless-entry systems among the retained information, helping buyers understand the intended memory coverage. A 9-volt alkaline battery is required but not included, so the stated setup has a separate battery requirement. The listing also advises switching off interior lighting while preparing the device.

Skip it if you want a USB-powered memory saver with status LEDs and a speaker; the JEUCLEL JEUS158 lists those features.

The Apopip OBD11 suits buyers seeking to retain driveability codes, clock, and keyless-entry settings through a battery change. Its stated setup calls for a 9V alkaline battery and switching off interior lighting.

Listed on Amazon as: Memory Saver for Car Battery On-Board Computers, OBD11