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Swapping your car battery shouldn’t mean an afternoon of re-entering radio presets, re-pairing your garage door opener, or worrying about the check-engine light. A memory saver slips into your OBD-II port or cigarette lighter and feeds the car’s computer a backup 12V feed while the main battery is out — so every setting stays exactly where you left it. This guide breaks down the best car memory saver options by how they get their power, how long they hold, and which cars they suit best.
I’m Rikta — the founder and writer behind FitlyFast. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
From clip-on OBD-II cables to 9-volt keepers, find the right car memory saver to protect your vehicle’s computer, clock, and radio presets during a battery change.
Our Picks at a Glance
How To Choose The Best Car Memory Saver
Pick the type based on where you can grab 12V power during a swap. Some savers tap the OBD-II port directly, some plug into a cigarette lighter, and a few run on a single 9V battery with no external source needed. Match the style to your car and your toolkit.
Power source decides everything
A saver that clips to a 12V battery or jump starter is the most flexible — it works on almost any car with a standard OBD-II port (1996 and later). A 9V-battery mini saver is the lightest and most portable, but it only holds enough power for a quick 10-15 minute swap, and some newer cars with “key-off” disconnection shrug them off entirely.
Fuses and polarity protection are non-negotiable
A decent saver builds in a fuse (you’ll see 5A or 8A ratings) plus reverse-polarity protection, which stops a wrong clip connection from frying the ECU. If the clips touch ground by accident, the fuse should blow — not your car’s computer. That single feature is worth paying a little more for.
Quick Comparison
| Model | Best For | Power Source | Weight | Safety Feature | Amazon |
|---|---|---|---|---|---|
| Clore SOLAR ESA30★ Best Overall | Best Overall — instant OBD-II power | 12V jump pack | 5.6 oz | Auto shut-off | Amazon |
| Vgate OBD II ConnectorBudget Champion | Budget-friendly clip-on saver | 12V battery | — | 8A fuse | Amazon |
| All-Sun GK504Lighter-Plug Pick | Lighter-plug convenience | 9V battery | 2.39 oz | — | Amazon |
| Powerbuilt 648539 | Older cars, 4-hour hold | 9V battery | 2.08 oz | Blocking diode | Amazon |
| MRCARTool E60 | Dual-power versatility | 12V or 8x AA | — | — | Amazon |
| OLLGEN 10ft Cable | Reaching another car’s battery | 12V lighter outlet | — | 8A max | Amazon |
| allsun EM2284 | Dual-input with LED status | 12V or lighter | 9.3 oz | 5A fuse | Amazon |
| Mem Retain 9v-001 | Clean terminal maintenance | 9V battery | — | Blocking diode | Amazon |
| E-Z Red MSBD28 | Long-reach lighter cord | 12V jump pack | 7.2 oz | Fuse | Amazon |
In‑Depth Reviews
1. Clore Automotive SOLAR ESA30 OBD II Memory Saver Connector
Our pick — over 4.5★ from 700+ verified ratings; the strongest balance of quality and price.
The crowd favorite that powers straight from any 12V pack and shuts itself off so your backup battery isn’t drained.
Plug this straight into the OBD-II port, clip the leads to a small portable generator or jump pack, and the heavy lifting is done. Buyers report it “kept all my radio and vehicle settings” when fed from a portable generator, and Tesla owners confirm it pairs cleanly with the car’s 12V outlet. The built-in auto shut-off is the quiet hero — it stops the saver from slowly killing your backup battery if you walk away mid-swap.
At 5.6 ounces, it’s heavier than the 9V mini-savers, but that weight buys a solid universal fit that owners mention locks in without wiggling. Subaru Outback owners in particular note zero adjustments needed after a battery switch — no radio reset, no engine recalibration. The trade-off is that you must have a 12V source handy; there’s no onboard battery here.
Owners consistently describe it as “essential for their tool box” and worth the money for the settings and engine calibrations it preserves. It’s the pick that works across the broadest range of cars because it doesn’t rely on a cigarette lighter that newer vehicles may kill with the key off.
What wins people over
- Auto shut-off protects your backup battery from draining
- Universal fit works on Teslas and Subarus alike
- Keeps emissions monitors ready for inspection after a swap
Before you buy
- Needs a separate 12V source — no onboard battery
- Bulks up your glove box more than a 9V stick
Reach for this if: you want one saver that works on whatever car you own, fed from any jump pack or generator.
Look elsewhere if: you want a tiny 9V stick for a fast swap and nothing else.
2. Vgate OBD II Memory Saver Connector with Two Alligator Clips
A wallet-friendly clip-on saver that preserves ECU memory, radio presets, and clock with a reassuring 8-amp fuse.
This is the simple, reliable formula: red clip to positive, black to negative, plug into the OBD-II port, and it draws from any 12V DC source — a jump starter, a lead-acid battery, or another car’s outlet. The 8-amp fuse built into the line is the safety net that makes overload protection feel real, not like a line-item on a spec sheet. Owners say it “works as advertised preserving radio presets, clock, ECU settings during battery swap.”
The honest quirk: it beeps continuously while powered, which is actually the confirmation it’s saving memory — but it’s loud enough that buyers suggest rolling up the windows and closing the doors before starting. There’s also no instruction manual in the box, so you’ll want to remember the correct order: clips to backup battery first, then OBD-II plug.
Compared to the Clore above, the Vgate skips the auto shut-off but costs less and still delivers the same core protection for a standard 12V-fed swap. For the price, it’s the best value way to avoid re-entering every preset in your car.
Why it’s a steal
- Works with any 12V source including jump starters
- 8A fuse protects against overload
- Snug OBD-II fit with solid clips
Keep in mind
- Constant beeping can be annoying — close the doors
- Exposed clips risk shorting if they touch metal
Grab it if: you want a no-frills, fuse-protected saver for a standard 12V swap without spending more.
skip it if: loud beeping or zero instructions would drive you up the wall.
3. All-Sun GK504 Automotive Setting Keeper
A featherweight 2.39-ounce keeper that runs on one 9V battery and plugs straight into the cigarette lighter.
If your car still has a live cigarette lighter, this is the easiest possible path. Pop in a 9V alkaline battery (not included), push the plug into the lighter socket, and the rugged hard-plastic body feeds power back to the computer. Customers note it “kept my aftermarket head unit & the PCM alive during the main battery change” — exactly the scenario that sends people to the dealer for a reflash.
The packaging lists a 10-watt draw, and the biggest gotcha is remembering to pull the 9V battery out after you’re done. Leave it in and the LED indicator light will quietly drain the battery flat — a mistake at least one owner admits to making. Quality is the most-praised trait, followed closely by how reliably it retains settings.
Note that success here is hit-or-miss across different cars; some owners find it works flawlessly while others report nothing happens, so treat it as a lighter-dependent convenience rather than a universal guarantee. But at 2.39 ounces, it’s the lightest thing you’ll carry for this job.
What owners love: the build quality and the way it holds settings on aftermarket head units and PCMs.
The real catch: functionality is mixed across vehicles — test it before you trust it on a critical swap.
Pick this up if: you want a tiny lighter-plug saver that hides in a door pocket until needed.
Think twice if: your car kills the lighter socket with the key off — it won’t work.
4. Powerbuilt Auto Vehicle Computer Memory Keeper
A 2.08-ounce 9V keeper that holds radio presets, ECM codes, and learned procedures for up to four hours.
This one bucks the trend by running on a single 9V battery and claiming a four-hour retention window — far longer than the quick 10-minute swaps most savers target. It plugs into the cigarette lighter outlet and maintains voltage continuity to the engine computer, clock, and radio memory so you can take your time. Reviewers point out it preserved door codes on older Ford Explorers and saved all settings on a 2013 Honda Civic with navigation, including destinations.
The clever engineering bit is a built-in diode that blocks voltage from flowing back into the 9V battery, which prevents overcharging and the explosion risk that comes with it. The instructions advise testing the lighter socket live first, or using Accessory mode, since a dead socket means a dead saver.
You get more trust with the Powerbuilt than with the lighter-based All-Sun above, because real shoppers say success: a Lexus GX470 driver saved seat memory and radio presets, and a Dodge Ram owner chose it to avoid the “delicate” OBD-II port path. But the lighter socket is the only way in, so if your car cuts power to that socket when you remove the key, this won’t work for you.
Why owners rate it
- 4-hour retention is generous for slow swaps
- Blocking diode prevents 9V overcharge risk
- Saved navigation destinations on a Civic with nav
Watch out
- Requires a live lighter socket or Accessory mode
- Some cars lose clock or need window reset
Ideal for: older cars and anyone who wants a long, unhurried window to finish a battery swap.
Not for: newer cars that fully power down the lighter socket with the key removed.
5. MRCARTool E60 OBDII Vehicle Emergency Power Supply Cable
The dual-power workhorse that draws from a 12V battery or an 8-AA battery box, so a dead lighter socket never stops you.
Most savers force you into one power path; this one gives you two. Clip it to any 12V source like a jump starter, or click in the included battery box loaded with 8 AA batteries (not included) and you’re powered — no cigarette lighter required. The whole cable runs 64cm, or about 25.19 inches, giving you room to reach a battery that isn’t parked right next to the OBD port. The maker notes a full 8-battery set can handle more than 10 vehicle swaps.
Subaru Impreza owners verified 12.8V at the port with a multimeter and kept every setting intact, while 4Runner and Tacoma buyers report no lost error lights or settings. The AA approach is what reviewers love most — it makes the tool endlessly reusable without hunting for a charged 12V pack. The caveat: it’s an emergency tool, not a long-term power supply, so swap the battery promptly.
A small annoyance: the LED on the OBD plug stays lit even when the car battery is connected, so you can’t tell at a glance if it’s on or off. The manufacturer backs it with a 24-month warranty, which is longer coverage than most in this category offer. For flexibility, it beats the single-path savers above.
What makes it versatile
- Two power methods — 12V clips or 8 AA batteries
- 25.19-inch cable reaches distant batteries
- 24-month manufacturer warranty
Know before you go
- 8 AA batteries not included
- LED stays lit regardless of connection state
Choose this when: you want maximum flexibility and don’t want to depend on a car’s lighter socket.
Pass on it if: you’d rather not keep a stock of AA batteries around.
6. OLLGEN 10ft OBD II Memory Saver Cable
The 10-foot cord that reaches a neighbor’s battery or riding mower so you can swap without a jump pack.
The whole point of this one is the 10-foot (3-meter) cable. When you don’t have a jump starter on hand, that length lets you plug into the cigarette lighter of another car parked alongside, or clip onto its battery, while you work on yours. It’s a male-to-female setup: OBD male into your car, cigarette-lighter female into the power source. The 8A maximum current keeps the draw modest, which is exactly right for memory-keeping.
Honda owners paired it with a BLUETTI power supply via the 12V connector and found the computer memory completely untouched after an AGM swap. One owner even ran it from a riding lawnmower battery while fetching a replacement. The design supports any 12V DC source, which is why it’s a staple for people who change batteries without a dedicated jump pack.
The short version of the honest caution: it blew a fuse in a 2016 Subaru Crosstrek when plugged into the OBD-II port, so Subaru owners should think twice. Reviews otherwise praise it for keeping garage-door pairing and seat positions intact on a 2019 Mazda, and for being significantly easier than reprogramming after a swap.
The long-cord advantage
- 10-foot reach to another car’s lighter or battery
- Works with BLUETTI supplies and lawnmower batteries
- Male-to-female setup is simple to route
Honest caution
- Subaru Crosstrek owners mention a blown fuse
- Instructions are not dependable — research your car first
Perfect for: driveway mechanics without a jump pack who can park a second car nearby.
Avoid if: you drive a Subaru and want zero risk of a fuse issue.
7. allsun OBD2 Memory Saver with Dual Power Input
A dual-input saver with smart LEDs that tell you power is flowing and warn you before the backup dips.
This one talks to you. Green LEDs confirm the connection is live, a second green LED means the backup battery is fully charged, and a red light is the low-power warning that prevents accidental data loss before it happens. You can feed it through the OBD-II port or the included cigarette lighter adapter, and it clips to any 12V battery — car, motorcycle, AGM, or gel cell — with SAE-standard clips. The maker rates it for 30+ minutes of power, enough for a relaxed swap.
The build is noticeably heavier at 9.3 ounces, which reflects a chunkier body and that 5A fuse (rated ф5×20 5A 250V) protecting the circuit. Reverse-polarity protection is built in, so clipped backwards it won’t fry your computer. Subaru Outback customers note perfect retention with dual green LEDs confirming power, and Highlander owners praise the preset and time preservation.
The recurring hiccup is that some 12V sources with power-safety check circuitry — like certain smart chargers — won’t play nice with it; it worked on a 1996 Sentra only via a bench supply. The LED hidden under the dash can be hard to see, and the cord is short enough that some owners needed jumper cables to extend it. Still, for a clear status readout while you work, nothing else here matches it.
What stands out
- Green/red LED status prevents surprise data loss
- Dual input — OBD-II port or lighter socket
- Reverse-polarity protection and 5A fuse
Watch the fit
- Incompatible with some smart-charger safety circuits
- Cord may be too short without extenders
Best for: owners who want visible confirmation the memory is being protected mid-swap.
Not for: anyone powering from a smart charger with a safety handshake.
8. Original Mem Retain 9V Battery Powered OBD II Connector
An American-assembled 9V stick that outshines lighter-socket models on newer cars that cut power with the key off.
Assembled in the USA and powered by a single 9V battery (not included), this one plugs directly into the OBD-II port, so it avoids the 12V cigarette-lighter socket that newer cars de-energize when you remove the key. Owners used it to keep settings alive while cleaning battery terminals — a job that usually triggers a full reset — and preserved everything from radio presets to seat positions and navigation settings.
The exclusive safe-voltage blocking diode is the technical centerpiece; it prevents the 9V battery from being back-fed or overcharged, which is the failure mode of cheaper sticks. Instructions are included and repeatedly praised as well-written, which is rare in this category. For best results, use a fresh 9V — or a lithium 9V, which owners say handles the higher current draw better.
There are two honest limitations. First, there’s no indicator light, so you can’t visually confirm it’s working. Second, the car’s existing battery needs at least a partial charge for it to function — if your battery is completely dead, this saver won’t help. It powered a 2013 Mini for about 12 minutes, which is plenty for a typical swap.
Why it’s reliable
- Works on newer cars with key-off socket shutdown
- Blocking diode prevents 9V back-feed risk
- Well-written instructions included
Know the limits
- No indicator light to confirm operation
- Needs a partially charged battery to work
Reach for this if: you drive a newer car and want a simple 9V stick that bypasses the lighter-socket problem.
Look elsewhere if: your battery is fully dead and you need the saver to be the only power source.
9. E-Z Red MSBD28 Auto Memory Saver
A 7.2-ounce OBD-to-lighter saver that runs off any 12V jump pack and keeps seat profiles and dash JPEGs intact.
This one connects your car’s OBD-II port to a cigarette-lighter plug, then draws from any 12V jump pack or another car’s port. The cord is long enough to reach conveniently, and the indicator light confirms power is flowing. Owners used it on a 2013 Acura RDX and preserved seat and mirror profiles, radio presets, and even a custom dash JPEG — no relearning needed afterward. The materials are plastic with a silver finish, and it weighs 7.2 ounces.
What buyers appreciate most is how it turns a potential dealer trip into a DIY job, with one owner noting it saved roughly versus a shop visit. The coiled wire is the recurring gripe — it’s stiff, especially in cool weather, which makes routing it a little fussy. There’s also a fuse that blows if the positive cable touches ground, and newer cars with fuse blocks mounted on the battery can make that harder to avoid.
Compared to the Vgate’s alligator clips, the E-Z Red uses a lighter plug instead, which is cleaner on cars where the socket stays live. It’s the pick for people who already own a portable charging pack and want zero extra batteries to buy.
What owners praise
- Long cord reaches a jump pack easily
- Preserved seat, mirror, and radio memory on an RDX
- Indicator light confirms power
The minor trade-off
- Coiled wire is stiff in cold weather
- Fuse blows if positive clip touches ground
Best for: owners with a portable jump pack who want a clean lighter-plug connection.
Pass if: you hate fighting stiff coiled cables in winter.
Understanding the Specs
Power source and runtime
9V-battery sticks are the lightest and most portable, but they only hold enough charge for a fast 10-15 minute swap and some newer cars won’t cooperate. 12V-powered savers that clip to a jump pack or another battery give you unlimited time and work on the widest range of vehicles. The MRCARTool E60 splits the difference with an 8-AA battery box, and the Powerbuilt 648539 stretches a single 9V to a four-hour hold.
Fuses and polarity protection
A saver’s most important job is protecting your car’s computer from a wiring mistake. Look for a built-in fuse (the Vgate carries an 8A, the allsun a 5A rated ф5×20 5A 250V) and reverse-polarity protection, which stops a wrong clip connection from sending voltage into the ECU the wrong way. The blocking diode found in the Powerbuilt and Mem Retain prevents back-feeding the 9V battery, which is what causes overcharge and explosion risk.
FAQ
Will a memory saver work if my battery is completely dead?
Why does my memory saver beep continuously?
Can I use a memory saver on a modern car with a key-off cigarette lighter?
How long will a 9V battery hold my car’s settings?
Is a memory saver the same as a battery tender?
Will using a memory saver void my car’s warranty or require dealer programming?
What happens if I connect the clips in reverse polarity?
Will my radio require a security code after using a memory saver?
Final Thoughts: The Verdict
Across the board, the car memory saver winner is the Clore Automotive SOLAR ESA30 because it combines universal OBD-II fit, auto shut-off to protect your backup battery, and the highest owner satisfaction in the group. If you want the most flexible power options, grab the MRCARTool E60 with its dual 12V and 8-AA power paths. And for a featherweight 9V stick that sidesteps newer cars’ key-off lighter shutdown, the Mem Retain 9V is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, FitlyFast earns from qualifying purchases. This does not affect which products we feature.