Top 9 Best Car Battery Isolator Relays (2020 reviews)

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We consider a relay battery isolator to be a worthy investment in the long run for your daily purposes. We are here to help you choose the best one for your needs from all the best available products in market today.

After carefully inspecting almost 100’s of relay battery isolators, we shortlist the below mentioned products. Our final set consists of the best products and we also managed to maintain variety within our picks to accommodate personal preferences.

Note: It doesn’t mean that the relay battery isolators that aren’t mentioned here are bad. We picked these because these will help most of the people.

Compared with other relay battery isolator in this category, the Keyline Chargers Car Battery Isolator Relay has a design with broader appeal. The keyline chargers car battery isolator relay is great for extreme vibration applications as well. Make sure this fits by entering your model number. Use these it’s like having two separate power sources for each battery while only having one alternator! Most importantly, the keyline chargers car battery isolator relay


In This Article:


Top 5 Best Car Battery Isolator Relays

#BrandRating
1Keyline Chargers Car Battery Isolator Relay – Best Overall 4.6
2Wirthco Car Battery Isolator Relay – Best Runner Up 4.4
3Online Led Store Car Battery Isolator Relay – Best Budget 4.6
4Intellitec Car Battery Isolator Relay4.6
5Pac Car Battery Isolator Relay4.5


1. Keyline Chargers Car Battery Isolator Relay – Best Pick

We are personally inclined towards Keyline Chargers Car Battery Isolator Relay, it is not so pricy, but it overachieves its purpose and outstanding in important aspects. Firmly enclosed for overall protection from dust, dirt, sand and any other substance that could cause damage to your isolator. This compact battery isolator was built ultra-small (2.6″ x 2.6″ x 2″) to fit almost anywhere! In conclusion, with 4.6 rating and more than 3576 buyers, the keyline chargers car battery isolator relay stands as the best choice.

Almost all customers agree that the relay battery isolator is great solution for battery isolation. Also, a few also found that the relay battery isolator is easy to install, good directions. Further, a few strongly agree that the relay battery isolator is achieved from basic grounding of the separate batteries only.

Top Customer Quotes:

  • A perfect fit under the hood to get close to your dual batteries
  • Have not used it yet (will update if rating changes)
  • Kit is well put together with great instructions
  • Giving you the green light to go extreme through any water conditions

2. Wirthco Car Battery Isolator Relay – Best Runner Up

We know from years of feedback from readers, amazon sellers, and family and friends what most people want in a relay battery isolator. The Wirthco Car Battery Isolator Relay is exactly that – it’s a simple relay battery isolator that hits all the right notes. The wirthco car battery isolator relay is suitable for marine use (ip62). Also, with a single push of the override/reset button, you can change the batteries to parallel mode for jump-starting. In addition, this includes mounting bracket that houses the 4″x4″x2″ isolator.

Above all, the wirthco car battery isolatorrelay is suitable for any vehicle with an auxiliary battery.

Almost all buyers quickly discovered that the relay battery isolator come with something to cover the positive terminal’s. Further, a few also found that the relay battery isolator is best product for the money. Also, they also found that the relay battery isolator come in handy a couple of times already. Moreover, this is a smart battery isolator, charger, and jump starter all rolled into 1 palm-sized device.

Top Customer Quotes:

  • Manufacturer says: we are also proud of our heritage of providing innovative quality products
  • The starting battery needed more than 150 a to turn it over
  • For the price this is really good
  • This is no manual override for starting battery

3. Online Led Store Car Battery Isolator Relay – Best Budget

Online Led Store offers a variety of relay battery isolator for personal choice and yet maintaining quality in all the variants. The Online Led Store Car Battery Isolator Relay comes with a 1 year manufacturer warranty. , please call us toll free 1-855-led-online (1-855-533-6654). This 4 pin relay has a high current carrying capacity of 200 amperage of load at 14 volts dc, making it the perfect component to be used in a split charging setup.

Lastly, the online led store carbattery isolator relay can be used in both automotive and marine settings.

Most buyers found that the relay batteryisolator is great value for the price, and works as advertised. In addition, a few say that the relay battery isolator has higher amp rated ones too. Moreover, they say that the relay battery isolator is great value for a 200 amp 12vdc relay. Also, the good is this relay is very quiet for a heavy duty unit, maybe it’s the thick housing but it is a lot quieter than the one i’m replacing. Overall, buyers found this to be one of the best relay battery isolator for daily purposes.

Top Customer Quotes:

  • Normally open with 60 ohms coil resistance
  • This is a big version of a bosch type relay
  • 1/4″ studs for power input and output
  • These relays are top of the line

4. Intellitec Car Battery Isolator Relay

We would, of course, be remiss if we didn’t mention Intellitec Car Battery Isolator Relay for daily usage. The intellitec car battery isolatorrelay is designed to withstand the shock and vibration experienced within commercial vehicles, trailers, coaches bus or boat applications. Make sure this fits by entering your model number. These unique latching disconnects designed and manufactured by intellitec are capable of carrying heavy currents.

Lastly, the intellitec carbattery isolator relay require no power to stay open or closed, the intellitec battery disconnects only draw power during activation.

Most customers agree that the relay battery isolator is great for theft prevention. Moreover, they say that the relay battery isolator is easy to do, well constructed. In addition, a few say that the relay battery isolator comes with a pair of 5a fuses. Also, the previous relay burned up, this fits perfectly, works as expected.

Top Customer Quotes:

  • Current rating is 100a continuous at 12v (this is from the intellitec website)
  • This part matched the original items
  • This is supposed to do effectively and without draining the battery itself
  • Battery disconnect relay 12 volts 100 amp

5. Pac Car Battery Isolator Relay

Best part: Pac Car Battery Isolator Relay costs comparatively low and it is available to ship in 24 hours. The pac car batteryisolator relay is great for isolating a second batter making it dedicated to the stereo system. For switching power sources and systems with heavy current draw. This relay between batteries as an isolator or in the main power lead servicing the mobile audio system, light bars or any other equipment requiring on/off control. Finally, the pac car battery isolator relay

One customer says – “Would definitely purchase again and highly recommend for high amp, extended use. “.Almost all buyers agree that the relay battery isolator does what it’s supposed to do.

Why We Like This:

  • Keeps primary starting battery from being drained
  • Handles 80-amps continuous and 150-amp surges
  • Does not create a voltage drop to the second battery like conventional isolators
  • Does not create any voltage drop to the secondary battery

Other Car Battery Isolator Relays We Reviewed

We looked at 4 other Car Battery Isolator Relays. Even though they didn’t make our 5 best Car Battery Isolator Relays list, they’re the best of the best and each is still a great option. The information you’ll need to compare each one is included with the listing.

Products You May Be Interested In

Pac Car Battery Isolator Relay

Pac Car Battery Isolator Relay

Most buyers opine that the relay battery isolator is perfect solenoid for your high current automotive project. A few strongly agree that the relay battery isolator is used to isolate a second battery powering audio, visual navigation, or other equipment.

Top Customer Quotes:

  • Does just what it said it would do
  • Handles 500 amps continuous and 700 amp surges
  • Does not create a voltage drop to the second battery like conventional isolate

Cost: $78.14

Ehdis Car Battery Isolator Relay

Ehdis Car Battery Isolator Relay

One customer says – “Make sure this fits by entering your model number. “.They also found that this relay does not appear to be rated for continuous duty.

Top Customer Quotes:

  • Package list: 1 * 4 pin 500a heavy current relay starter battery isolator
  • Rated voltage 12vdc, maximum instantaneous through current 500a. Work long times maximum 200a
  • Ensuring heavy current can be transited safely

Cost: $25.99

Nvx Car Battery Isolator Relay

Nvx Car Battery Isolator Relay

One customer says – “Continuous power handling of 200 amps at 12v and surge power handling of 300 amps. “.Most customers quickly discovered that the relay battery isolator is powered on 4 to 8 hours at a time while traveling.

Top Customer Quotes:

  • Easy wire up, but use with a fuse or breaker
  • All of this will ensure that your battery will be isolated with confidence!
  • Doesn’t create a voltage drop to your second battery unlike common isolators do

Cost: $44.99

Ehdis High Current Battery Isolator

Ehdis High Current Battery Isolator

Most customers found that the relay battery isolator does the same thing, at much less cast. They strongly agree that the relay battery isolator can through this switch to call vice battery to start.

Top Customer Quotes:

  • 300 amps surge power handling (peak current)
  • This can through this switch to call vice battery to start
  • Worked for 20, 000 miles and a full summer of living in a van

Cost: $48.99