

🔌 Power up your adventure with smart, rugged dual battery control!
The Nilight 12V 140 AMP Dual Battery Isolator is a smart voltage sensitive relay designed to automatically manage and charge two 12V batteries simultaneously. Featuring a robust IP66 waterproof casing and silicone seal, it withstands harsh environments, making it ideal for trucks, RVs, UTVs, and boats. The built-in LED voltmeter provides real-time voltage monitoring, while the isolator ensures your main battery stays charged and ready to start your vehicle. Easy to install with included hardware, this isolator supports up to 140 amps and comes with a 2-year warranty.
















| ASIN | B0CZN1N411 |
| Best Sellers Rank | #11,727 in Automotive ( See Top 100 in Automotive ) #28 in Automotive Replacement Battery Switches |
| Brand | Nilight |
| Brand Name | Nilight |
| Circuit Type | 2-way |
| Color | 140 Amp w/Voltmeter |
| Connector Type | Quick Connect |
| Contact Material | Aluminum |
| Contact Type | Normally Open |
| Control Method | Sensor |
| Current Rating | 140 Amps |
| Customer Reviews | 4.3 out of 5 stars 249 Reviews |
| Included Components | Dual Battery |
| Item Dimensions | 2 x 2 x 1 inches |
| Manufacturer | Nilight |
| Material Type | Metal, Plastic |
| Model | 90333A |
| Mounting Type | Screw Mount |
| Number of Items | 1 |
| Operating Voltage | 12 Volts |
| Operation Mode | Automatic |
| Specification Met | ABS |
| Switch Type | Relay |
| Terminal | Screw |
| UPC | 840323914352 |
| Unit Count | 1.0 Count |
| Warranty Description | 2 Years Warranty |
| Wattage | 1680 watts |
R**B
Works great.
Bought two for a project that I was working on and they work great. Couple things. If either battery is above 12.8v, the relay stays closed. I don't know why I thought it would only look for voltage from the supply side, but it watches both batteries. The instructions aren't great but a Google search and it's pretty easy to figure out what they don't tell you.
B**M
Very nice!
Very effective and for the price, you can't go wrong. Works in BOTH directions. As in, if either source goes above 13.3 volts it will join them.
D**R
As always make sure to have a good clean ground connection
Works just as advertised.. it seems not quite designed for heavier gauge cables, as far as physical space to secure them, etc.. , yet otherwise works great and exactly as advertised.
K**V
Poor durability and unresponsive customer service. Dies
After a month of use on my boat, it stopped working. For a month, it was working well for 2 batteries on my boat. However, as seen in the picture, the display stopped working and I am suspecting that the device itself is also not working. I have reached out to the customer service multiple times, but they are not responding. I would avoid purchasing this item. BE AWARE!
T**Y
Battery system
Works no problems
A**R
Great product
Nice little battery. Very powerful without taking up a lot of space
W**M
Perfect for LiFePo batteries.
In my old Ranger I have this between my main battery and two LiFePo batteries (20Ah each) wired in parallel. I have higher power ham radios that I run with my truck off (due to engine noise) and now have no fear of draining my main battery and getting stranded (or at least bothered to get the jump kit out.) Installation is straight forward, and operation is set and forget. Now my dashcam can run 24/7 too. I don't have to worry that I forgot to turn the radios off. If you use a good LiFePo battery with built-in BMS, you won't have any problems using this. This makes it so simple. This would be great for any camping situation or if you need to run a lightbar/flasher for an extended time.
K**R
Battery hook up on the second one
It has everything you need to hook up a second battery
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