How does a VSR isolator work?

The voltage sensitive relay connects the two batteries when charging voltage is present, so the auxiliary battery charges. When voltage falls, it disconnects them so the starting battery is not drained.

Can I use it with a lithium battery?

It is specified for lead-acid batteries. Lithium batteries have different charging voltage profiles, so check compatibility before pairing.

What is the manual mode for?

Manual mode lets you close or open the relay yourself, for example to jump-start from the auxiliary battery or to link the batteries deliberately.

What is included in the kit?

The dual battery isolator with its built-in voltmeter and a 2 ft 6 AWG cable.

Is 80 amps enough for my setup?

It suits moderate charging currents, typical of UTVs and small accessory batteries. High-output alternators or large auxiliary banks may need a higher-rated isolator.

Where is the Dual Battery Isolator Kit 12V 80 Amp VSR cheapest?

At Wayfair, for $59.99, as of our latest check.

Dual Battery Isolator Kit 12V 80 Amp VSR

Best price now

$59.99at WayfairChecked Nov 3

Prices are checked against each store and labelled with when.

Visit Wayfair

Dual Battery Isolator Kit 12V 80 Amp VSR

Best price now

$59.99at WayfairChecked Nov 3

Prices are checked against each store and labelled with when.

Visit Wayfair

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Price facts

Last seen at $59.99 at Wayfair on Nov 3.

Our take on the Dual Battery Isolator Kit 12V 80 Amp VSR

This is a 12V dual battery isolator kit built around an 80 amp voltage sensitive relay. It connects a main and auxiliary battery so the second one charges while the engine runs and is cut off when voltage drops, protecting the starting battery. It runs in automatic VSR mode or manual mode, and a built-in LCD voltmeter shows battery voltage. It suits UTV owners and small off-road builds adding a second battery for accessories. Compared with plain relay isolators, the manual override and voltmeter are the extras; it is aimed at lead-acid batteries, not lithium.

Best forUTV owners adding an auxiliary batterySmall off-road and 4x4 accessory setupsOwners who want to see battery voltage at a glanceDIY installs with short cable runs

Pros

Automatic VSR plus manual override in one unit
Built-in LCD voltmeter
80 amp rating handles moderate charging loads
Includes a 2 ft 6 AWG cable
Simple two-battery wiring

Cons

Designed for lead-acid batteries, not lithium
80 amps limits use with high-output charging systems
Short 2 ft cable may not reach every mounting spot
No smart charging or app monitoring

Dual Battery Isolator Kit 12V 80 Amp VSR prices at every store

WayfairNew
Availability unknown
$59.99Checked Nov 3
Visit Wayfair

Dual Battery Isolator Kit 12V 80 Amp VSR price history

Lowest price we've seen: $59.99 on Nov 3 at Wayfair. Tracked across 1 store since Nov 3.

From Wayfair

12V 80 Amp dual battery isolator kit
Manual and automatic VSR (voltage sensitive relay) operation
Built-in voltmeter with LCD screen
2 ft 6 AWG cable included
Smart battery isolator compatible with lead-acid batteries
For UTV use

Shipping: Free fast delivery; estimated arrival by Sun, Nov 15
In the box: Dual battery isolator kit, 2 ft 6 AWG cable

About the Dual Battery Isolator Kit 12V 80 Amp VSR

This is a 12V, 80 amp dual battery isolator kit. It works as a voltage sensitive relay (VSR) and can be operated manually or automatically.

A built-in voltmeter with an LCD screen shows battery voltage. The smart isolator is compatible with lead-acid batteries and is intended for UTV use. The kit includes a 2 ft 6 AWG cable.

Voltage: 12V
Current: 80 amp
Operation: Manual and automatic (VSR)
Display: Built-in voltmeter with LCD screen
Cable: 2 ft, 6 AWG
Compatibility: Lead-acid batteries
Intended use: UTV
In the box: Dual battery isolator kit, 2 ft 6 AWG cable

Questions and answers

How does a VSR isolator work?: The voltage sensitive relay connects the two batteries when charging voltage is present, so the auxiliary battery charges. When voltage falls, it disconnects them so the starting battery is not drained.
Can I use it with a lithium battery?: It is specified for lead-acid batteries. Lithium batteries have different charging voltage profiles, so check compatibility before pairing.
What is the manual mode for?: Manual mode lets you close or open the relay yourself, for example to jump-start from the auxiliary battery or to link the batteries deliberately.
What is included in the kit?: The dual battery isolator with its built-in voltmeter and a 2 ft 6 AWG cable.
Is 80 amps enough for my setup?: It suits moderate charging currents, typical of UTVs and small accessory batteries. High-output alternators or large auxiliary banks may need a higher-rated isolator.
Where is the Dual Battery Isolator Kit 12V 80 Amp VSR cheapest?: At Wayfair, for $59.99, as of our latest check.