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Moving your car, truck, or boat battery to the trunk or trailer bed clears out engine bay space and fixes weight distribution, but the hard part is finding a kit where everything lines up without a fight. The wrong kit means drilling new holes, splicing cables, or dealing with a tray that rattles loose on the first bump. This guide compares seven popular battery relocation kits on Amazon, from budget steel boxes to complete trunk-mount cable kits, so you can pick one that bolts in cleanly.
I’m Min — the founder and writer behind Gadgets Feed. 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.
Whether you’re moving the battery for more engine room or a custom audio setup, this rundown cuts through fitment confusion with real owner insights.
Our Picks at a Glance
How To Choose The Best Battery Relocation Kit
Before you buy a battery relocation kit, you need to know three things: where the battery will go, the group size number printed on your battery, and whether the kit includes the heavy cables. The most common mistake is ordering a tray without checking that group size number, which leaves you with a box that is slightly too small or too large for your terminals.
Match the Battery Group Size First
Every battery box lists the group series it fits, such as 27 or 34. Measure the length, width, and height of your current battery before ordering, because a group 24 battery is noticeably smaller than a group 31. If a box says it fits a range like 24, 27, 31, you have more flexibility, but if it is built for one size, the fit is tight by design.
Check the Cable and Hardware Included
Some kits are just the box and mounting straps, while others ship with the positive and negative cables, a buss bar, and a vent tube. For a trunk relocation, the cable length matters more than anything else, because a short positive cable means you are buying an extension kit. Look for kits that list the exact cable gauge and length, rather than ones that stay vague about the wire size.
Quick Comparison
| Model | Best For | Material | Group Size | Weight | Amazon |
|---|---|---|---|---|---|
| KEMIMOTO Sportsman 450 570★ Best Overall | ATV factory-fit relocation | Alloy Steel | Sportsman specific | 2.28 kg | Amazon |
| peastorm Assemble Steel BoxBest Value | Group 27 car/RV/trailer | Steel | 27 | 10 pounds | Amazon |
| NUMAKY Aluminum Kit | Weight-saving muscle cars | Aluminum | Varies | 6.98 pounds | Amazon |
| peastorm Waterproof Steel Box | RV and marine setups | Steel | 27 | 4.79 kg | Amazon |
| CNRAQR Universal Billet Kit | Race and custom builds | Aluminum | Universal | 11.08 pounds | Amazon |
| Taylor Cable Trunk Mount | Street cars needing long cables | Painted Steel | Universal | 5 pounds | Amazon |
| JEGS Marine-Type Kit | Multi-size marine/street | Steel | 24, 27, 31, 34, 35, 51, 78 | 11.65 pounds | Amazon |
In-Depth Reviews
1. KEMIMOTO Battery Relocation Kit (Sportsman 450 570)
Our pick — 4.5★ from 300+ verified ratings; the strongest balance of quality and price.
The factory-fit ATV relocation that makes battery access actually enjoyable.
The standout feature here is the fitment range: it is made for the 2014 through 2021 Sportsman 450 and 570, and owners say it bolts into the factory rear holes just like a stock part. The 2.28 kg alloy steel construction protects the battery from trail abuse.. It is not compatible with the X2 model because of the bed, so check your exact machine before ordering.
What wins people over is the ease of installation, with owners reporting a simple drop-in process that clears the oil filter and gives you easy rear battery access. The kit includes the wires and a buss bar that simplify the hookup, and the cable length gives plenty of routing options. The main trade-offs are the instructions, which are not thorough, and the included bolts coming across as longer than they need to be.
Owners sum it up best: “This is exactly what Polaris should have done at the Factory! Perfect fit, easy install, quality components.” The few fit complaints center on the box not sitting perfectly flush, but for most Sportsman owners the factory-matched holes make this the cleanest option of the seven.
Simple OEM-style fit
- Factory-matched bolt holes for 450/570 models
- Clears the oil filter for easy maintenance
- Includes wiring and buss bar for simpler hookup
Needs drilling care
- Instructions are thin on detail
- Some owners find the bolts too long
Trail use: you own a 2014-2021 Sportsman 450 or 570 and want a relocation that bolts in without custom fabrication.
Street builds: you have an X2 model, since the bed blocks this kit’s fitment.
2. peastorm 12V Steel Battery Box (Group 27)
A steel shell that protects your group 27 battery from sun and fire.
At 10 pounds, this is the heavier steel option, and that weight translates into serious protection for a group 27 battery in a car, RV, trailer, or boat. The steel body’s black spray coating is fireproof and UV-resistant., with handles on both sides and a lockable top cover. The maximum internal capacity is 13.78″ L x 7.8″ W x 11″ H, so measure your battery first because this is built for a specific size range.
Owners praise the material quality, noting that the parts fit together flawlessly and the box is “nicely painted and looks great when assembled.” Plan for about 10 minutes of assembly, because this kit arrives unassembled by design. The recurring gripe is the assembly process itself, which some find tedious, and there are no built-in provisions for routing battery cables, so plan for that.
Owners describe “precision tooling and proper finish,” and the box even includes extra bolts and nuts for the mounting holes.
Steel case value
- Lockable lid adds security for outdoor use
- Fireproof and sunscreen steel coating
- Extra bolts and nuts included
Heavy for trunk
- Requires about 10 minutes of assembly
- No clear provisions for cable routing
Budget swaps: a group 27 battery in a trailer or RV where you want a lockable, fire-resistant steel shell on a budget.
Weight savers: you want a zero-assembly box or need a built-in channel to route the battery cables cleanly.
3. NUMAKY Aluminum Battery Box Kit
The lightest box here that still protects like steel, made for classic muscle cars.
Weighing just 6.98 pounds, this aluminum kit is about 43% lighter than the peastorm steel box above, which makes a real difference when you are mounting it in a trunk or trailer where every pound counts. The aluminum body dissipates heat quickly to prevent battery overheating., and the natural oxide film resists corrosion in harsh conditions. It is explicitly compatible with 1964-2009 V6 V8 GT500 GT LX Cobra Ford Mustang and Steeda, Roush, and Saleen vehicles, so this is a muscle-car favorite.
The kit comes complete with battery connection clips, thickened aluminum press strips, screws, nuts, washers, and even a wrench, though cables are not included. Installation is a 4-step process that needs no complex tools. The main caveat from owners is the protective film on the aluminum plate, which is hard to remove, and one owner reported the paint delaminating when it got wet.
Owners describe it as “sturdy yet light” and say “I highly recommend.” If you own a Mustang and want to shed weight without losing battery protection, this aluminum build hits the balance that heavier steel boxes cannot.
Lightweight billet build
- Lightest option at 6.98 pounds
- Corrosion-resistant aluminum oxide film
- Complete mounting hardware with wrench
No hardware specs
- Cables not included in the box
- Protective film is tough to peel off
Racing installs: muscle car owners (especially Mustangs) who want the lightest possible box and do not mind supplying their own cables.
Full kits: you expect a plug-and-play kit with everything for a trunk relocation, since the cable is a separate purchase.
4. peastorm Waterproof Steel Battery Box (Group 27)
The lockable, weather-sealed steel box that handles rough trailer duty.
This is the pricier sibling of the peastorm box above, and the extra money buys a lockable lid with a lock included in the packing list, plus a weatherproof steel design rated for marine use. At 4.79 kg it is built like a tank, and The spray black coating is waterproof and UV-resistant.. The internal capacity matches the other group 27 box at 13.78″ L x 7.8″ W x 11″ H, so it fits the same battery sizes.
Owners rave about the rock-solid construction, calling it “durable steel, weatherproof coating for rough conditions” and noting the spring latch works great. The 4 predrilled holes align with angle iron for mounting, and there is plenty of room for bigger batteries. The trade-off is size: one owner found the box about 1/16″ off in each direction, which made fitting into a tight 14×8 space difficult, and battery handles can block the fit if your battery is on the large side.
Owners praise it as “rock-solid protection for your battery setup” and note it solves battery removal issues on travel trailers. If you need a lockable box that survives boat docks and gravel roads, this is the more complete package than the budget peastorm version.
Sealed weatherproof shell
- Lock and key included for security
- Weatherproof coating for marine conditions
- Plenty of room for larger batteries
Tight cable access
- Dimensions are tight against a 14×8 space
- Battery handles can block the fit
Wet climates: you need a lockable, weather-sealed steel box for a travel trailer or boat that will face rain and rough roads.
Quick access: your mounting space is exactly 14×8 inches, since the box runs slightly large and may need persuasion to fit.
5. CNRAQR Universal Billet Aluminum Battery Box Kit
The complete race-ready package with the longest positive cable in this lineup.
Unlike the bare boxes above, this kit includes the full wiring package: 16 feet of 5 AWG positive cable and 3 feet of 5 AWG negative cable, plus the battery connections and a breather tube. The fully sealed aluminum box is designed for street, race, custom truck, and SUV applications, making it a true bolt-in plug-and-play kit. At 11.08 pounds, it is on the heavier side, but the included hold-down with wing nuts keeps the battery secure.
Owners consistently praise the billet aluminum quality, saying the box “looks amazing in my car.” The big trade-off is the cable size: several owners note the wire is half the size it should be for a serious starter draw — one owner had to order a 0 gauge kit to power a four-cylinder. The lack of printed instructions is a recurring complaint, though the listing page has a helpful install video.
Owners call it “a very very good product” while wishing for thicker gauge wire. If you are running a high-compression engine or a long cable run, budget for a larger gauge cable upgrade alongside this box.
Universal billet mount
- 16 ft of 5 AWG positive cable included
- Fully sealed for race or street use
- Breather fitting and tube for venting
Bracket alignment fuss
- Cables are too thin for high-draw starters
- No paper instructions in the box
Custom bays: a race or custom build where you want one box with the cables, vent, and hold-down all in the package.
Drop-in needs: a thicker cable upgrade if your engine needs serious cranking amps over a long run, since the 5 AWG is on the thin side.
6. Taylor Cable 48000 Single Trunk Mount Battery Relocator Kit
The battle-tested trunk kit with enough cable length for the longest cars.
The defining strength of this kit is the cable length. Retired owners who have run it since 2017 report the positive cable reaches easily to the front of long cars like a ’59 Bel Air “barge” with room to spare. The rubberized tray resists corrosion and chipping., and multiple mounting holes give you flexibility for weird trunk layouts. It has been the go-to trunk relocation kit for street car owners for years.
Owners describe it as “easy to install” with “well-built parts,” and the kit has held up for years of daily use without rust on the tray. The trade-off is the documentation, which lacks clear instructions, and owners recommend adding a 90-120A marine or audio circuit breaker near the rear battery for short protection. One long-distance runner noted an AGM battery needs an occasional trickle charge given the cable gauge and distance.
Owners give it a “12/10 rating” for durability and call it “a quality product.” If you want a trunk relocation that you install once and forget for years, this is the premium choice that beats the budget boxes on longevity.
Trunk-mount cable set
- Ample positive cable for long cars
- Corrosion-resistant rubberized tray
- Proven durability over years of use
Box not included
- Instructions are minimal
- Add a circuit breaker for short protection
Trunk relocates: you want a proven trunk-mount kit with enough cable for a full-size car and years of trouble-free service.
Engine bays: you need printed step-by-step instructions, since this kit assumes you know how the wiring should go.
7. JEGS Automotive/Marine-Type Battery Relocation Kit
The made-in-USA box that fits seven different battery group sizes.
This JEGS kit stands out for its universal fitment, accommodating battery group types 24, 27, 31, 34, 35, 51, and 78 series. That makes it the single most flexible box in this lineup, useful whether you are moving a battery in an S14, a Dodge Avenger, or a boat. It measures 14.75 inches long by 8.125 inches wide by 10 inches high, and it meets Coast Guard requirement 183.420 for marine use.
The main reason to choose this over the peastorm boxes is the multi-size compatibility combined with that marine certification. Owners used it for a trunk relocation in an S14 and to fix a winter starting problem in a 2008 Dodge Avenger, describing it as going in easy and being “exactly as advertised.” The caveat is the physical size — one owner returned it because it was “just too big” for their application, and another had to mount it in a different direction than planned.
It is the heaviest kit here at 11.65 pounds and made in the USA with high-quality materials. If your project might change batteries down the road, the seven-group fitment saves you from buying a second box later.
Marine-grade terminals
- Fits 7 different battery group sizes
- Meets Coast Guard requirement for marine use
- Made in the USA with quality assembly
Basic cable lengths
- Large footprint may not suit tight trunks
- Heaviest option in this lineup
Boat or RV: owners who want one box that will fit whatever battery they run now and later, on land or on the water.
Precise fit: tight installations where floor space is scarce, since the box is noticeably bulky.
Understanding the Specs
Battery Group Size
This is the industry code for a battery’s physical dimensions, such as 24, 27, 31, or 34. Each group size has set length, width, and height measurements, so a box built for group 27 will not securely hold a group 34 battery. Always measure your current battery’s dimensions and match them against the box’s stated maximum capacity size before you order.
Cable Gauge and Length
Cable gauge refers to the thickness of the wire, with lower numbers meaning thicker wire — 5 AWG is thinner than 0 AWG. Thicker wire carries more current over long distances without voltage drop, which matters when a battery sits in the trunk far from the starter. Longer cable runs, like 16 feet, give you routing flexibility but also increase resistance, so match the gauge to your engine’s cranking needs.
FAQ
Will a battery relocation kit fit my specific car model?
What is the difference between steel and aluminum battery boxes?
Do I need to buy cables separately with these kits?
How long does it take to install a battery relocation kit?
Is a battery relocation kit safe for marine use?
Why is the cable gauge important for a trunk relocation?
Can I lock a battery box to prevent theft?
What happens if my battery is too big for the box?
Final Thoughts: The Verdict
For most ATV owners, the battery relocation kit winner is the KEMIMOTO Sportsman 450 570 because it bolts into factory holes with zero fabrication, making it the closest thing to a stock part. If you want a lockable steel box that survives marine conditions, grab the peastorm Waterproof Steel Box. And for a trunk relocation that will last years, the Taylor Cable Trunk Mount is the one to reach for with its long run of proven cable.
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 September 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gadgets Feed earns from qualifying purchases. This does not affect which products we feature.