How is this different from a plain battery isolator?

It switches automatically based on voltage and adds an LCD readout. A plain isolator only connects and disconnects, with no display.

Will it charge a lithium auxiliary battery?

It passes alternator voltage through when the main battery is charged. It does not boost voltage, so a lithium battery that needs a higher charge voltage is better served by a DC-DC charger.

What does the 140A rating mean for my setup?

It is the current the relay is built to carry between the batteries. Keep your charging current and cable sizing under that figure.

Does it drain the main battery when the vehicle sits?

The relay separates the batteries when voltage drops, so the auxiliary loads stay off the main battery. Small standby draw from the electronics is normal.

Can I use it on a 24V system?

No. It is a 12V unit for cars, RVs and boats with 12V electrical systems.

What do I need to install it?

Battery cable sized for your current, fuses on both battery connections, and a mounting spot near the batteries. Check the box for included hardware.

CAFORKP 12V 140A Dual Battery Isolator, Smart VSR with LCD

Best price now

$25.62at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

CAFORKP 12V 140A Dual Battery Isolator, Smart VSR with LCD

Best price now

$25.62at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $25.62 at Walmart on Nov 10.

Our take on the CAFORKP 12V 140A Dual Battery Isolator, Smart VSR with LCD

The CAFORKP is a 12V voltage-sensitive relay that links a main and an auxiliary battery, charging the second only when the main is up, and separating them when the engine is off. It is rated at 140A and adds an LCD readout so you can watch voltage without a separate gauge. That screen and the current rating put it above plain isolators that only switch and show nothing. It suits owners adding a second battery to a car, RV, boat or camper who want automatic charging without a manual switch.

Best forRV and camper dual-battery setupsBoat house and starter battery banksOverlanding and 4x4 auxiliary batteriesOwners who want to see voltage at a glance

Pros

140A rating covers most single auxiliary battery charging loads
Automatic connect and disconnect, no manual switch to remember
LCD shows voltage so you can check both batteries
Works in cars, RVs and boats on 12V systems
Simple two-battery wiring with no separate controller

Cons

Not a DC-DC charger, so it will not boost voltage for lithium or long cable runs
140A limit rules out very large banks or high-output alternators
LCD and electronics add failure points a plain relay does not have
Mounting and wiring hardware is not always included

CAFORKP 12V 140A Dual Battery Isolator, Smart VSR with LCD prices at every store

WalmartNew
In stockSold by CAFORKPReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$25.62+ $10.00 shippingChecked Nov 10
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About the CAFORKP 12V 140A Dual Battery Isolator, Smart VSR with LCD

12V 140A Dual Battery Isolator, Smart VSR with LCD for Car RV Boat

Questions and answers

How is this different from a plain battery isolator?: It switches automatically based on voltage and adds an LCD readout. A plain isolator only connects and disconnects, with no display.
Will it charge a lithium auxiliary battery?: It passes alternator voltage through when the main battery is charged. It does not boost voltage, so a lithium battery that needs a higher charge voltage is better served by a DC-DC charger.
What does the 140A rating mean for my setup?: It is the current the relay is built to carry between the batteries. Keep your charging current and cable sizing under that figure.
Does it drain the main battery when the vehicle sits?: The relay separates the batteries when voltage drops, so the auxiliary loads stay off the main battery. Small standby draw from the electronics is normal.
Can I use it on a 24V system?: No. It is a 12V unit for cars, RVs and boats with 12V electrical systems.
What do I need to install it?: Battery cable sized for your current, fuses on both battery connections, and a mounting spot near the batteries. Check the box for included hardware.
Where is the CAFORKP 12V 140A Dual Battery Isolator, Smart VSR with LCD cheapest?: At Walmart, for $25.62, as of our latest check.