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Deal.ai › KFFKFF › UTV Graphics Kits
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KFFKFF Dual Battery Isolator Kit, 12V 80 Amp, Manual and Automatic VSR Voltage Relay with Voltmeter, LCD Display

KFFKFF Dual Battery Isolator Kit, 12V 80 Amp, Manual and Automatic VSR Voltage Relay with Voltmeter, LCD Display

Best price now

$39.99at WalmartChecked Nov 10

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Price facts

  • Last seen at $39.99 at Walmart on Nov 10.

Our take on the KFFKFF Dual Battery Isolator Kit, 12V 80 Amp, Manual and Automatic VSR Voltage Relay with Voltmeter, LCD Display

The KFFKFF Dual Battery Isolator Kit is a 12V, 80-amp voltage-sensitive relay that automatically connects and disconnects an auxiliary battery to prevent the starting battery from draining. It has a manual override and an LCD voltmeter that shows both battery voltages. The plastic housing is sealed against water and dust, and the compact size suits UTVs, ATVs, jet skis and snowmobiles. It is a low-cost alternative to premium isolators like Blue Sea or Victron, but it lacks the brand support and documented reliability of those units.

Best forUTV and ATV owners adding a second batteryJet ski and snowmobile riders with auxiliary electronicsDIY installers who want a simple, low-cost isolatorCampers and off-roaders who need to protect the starting battery
Pros
  • Automatic voltage-sensitive relay prevents main battery drain
  • Manual override for winching or emergency paralleling
  • LCD voltmeter displays both battery voltages
  • Compact, sealed plastic housing resists water, dust and shock
  • Simple installation with basic tools
Cons
  • 80-amp rating limits use with high-output alternators or large loads
  • No detailed installation instructions included
  • Voltmeter accuracy is not specified
  • Plastic housing may not withstand extreme heat or long-term vibration
  • No brand support or warranty details provided

KFFKFF Dual Battery Isolator Kit, 12V 80 Amp, Manual and Automatic VSR Voltage Relay with Voltmeter, LCD Display prices at every store

  • WalmartNew

    In stockSold by Tools & Hardware Shop USReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $39.99Checked Nov 10
    Visit Walmart

About the KFFKFF Dual Battery Isolator Kit, 12V 80 Amp, Manual and Automatic VSR Voltage Relay with Voltmeter, LCD Display

This is a 12V, 80 amp dual battery isolator kit with a voltage-sensitive relay (VSR) and a voltmeter display. It is made for UTVs, ATVs, jet skis and snowmobiles. It can also be mounted under the hood of a vehicle with a dual battery setup.

The isolator keeps power from transferring between the two batteries, which reduces the risk of battery drain. This keeps the primary battery charged for starting the engine. The display shows the voltage of both the primary and auxiliary batteries.

The housing is plastic and protects against water, dust and shocks. The unit is compact enough for tight spaces. Installation takes a few steps and basic tools.

Model
VSR004
Rated power
DC 12V, 80A
Material
Plastic PA6 isolator with copper wire
Color
Black
Dimensions
3.3 x 1.7 x 1.5 in (85 x 43 x 37 mm), L x W x H
Weight
0.9 lbs (0.43 kg), including all accessories
Display
Voltmeter showing primary and auxiliary battery voltage
Use with
UTVs, ATVs, jet skis, snowmobiles
In the box
1 x dual battery isolator kit, 1 x user manual

Specifications

color
BlackSource
size
3.3" x 1.7" x 1.5"Source

Questions and answers

What is the difference between manual and automatic mode?
In automatic mode, the relay connects the auxiliary battery when the main battery reaches a set voltage and disconnects it when voltage drops, protecting the starting battery. Manual mode lets you force the connection, useful for self-jumping or winching.
Will this work with a 100Ah lithium battery?
It can, but the 80-amp rating may be too low for high charging currents. Check that your alternator and loads stay within 80 amps. Lithium batteries often require a DC-DC charger for proper charging profile.
Does it come with wiring and fuses?
The kit includes the isolator and voltmeter, but wiring and fuses are not mentioned. You will likely need to supply your own cables and fuses.
Is it waterproof enough for a jet ski?
The housing is described as resistant to water and dust, but not fully waterproof. For jet ski use, mount it in a dry area and consider additional sealing.
How do I wire the voltmeter?
The voltmeter displays both battery voltages. Connect its sensing wires to the main and auxiliary battery positives. Detailed wiring instructions are not included, so basic electrical knowledge is helpful.
Where is the KFFKFF Dual Battery Isolator Kit, 12V 80 Amp, Manual and Automatic VSR Voltage Relay with Voltmeter, LCD Display cheapest?
At Walmart, for $39.99, as of our latest check.

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