JOHO Smart Dual Battery Isolator: Automatic charging relay
Available Options
Meet the Smart Dual Battery Isolator—your go-to gadget for keeping your vehicle or boat's batteries in tip-top shape. It's got this nifty automatic charging relay that's like a personal trainer for your batteries, making sure they get just the right amount of juice without going overboard. And with its voltage measurement relay, you're always in the loop, thanks to real-time monitoring that's as sharp as a hawk. Built tough with marine-grade construction, this little warrior laughs in the face of harsh environments. Perfect for those rocking dual battery setups, it's the secret sauce to longer battery life and smoother performance.
- No more guessing games—the automatic charging relay keeps your batteries perfectly charged.
- Stay informed with the voltage measurement relay, because surprises are for birthdays, not battery levels.
- Marine-grade? More like marine-proof. This thing's built to last.
- Dual battery systems? Absolutely. It's like peanut butter and jelly—just meant to be.
- Voltage measurement relay
- Marine battery isolator
- Dual battery system
- Automatic charging relay
General specs
- Brand: JOHO
- Seller: Joom
- Compatibility: Dual battery systems
- Construction: Marine-grade
- Features: Automatic charging relay, Voltage measurement relay
- First listed by seller: 5/30/25
If you are interested in more details, you can find full information on the seller's page.
Shipping options
United States
Comparison with similar products
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Smart Dual Battery Isolator Automatic charging relay
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Smart Dual Battery Isolator Automatic charging relay
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Smart Isolator with Dual Batteries 12V 140A capacity
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VEVOR OT029
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VEVOR VSR002
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Automatic Charge Switch for RVs 12V/24V automatic switching
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| Brand | JOHO | Rustic Elegance House | Timeless Home | VEVOR | VEVOR | VehicleKit |
| Model | OT029 | VSR002 | ||||
| Color | ||||||
| Rating |
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| Price | $71.13 | $37.82 | $61.62 | $53.99 | $21.90 | $23.14 |
| Seller | Joom | Joom | Joom | Vevor | Vevor | Joom |
| Update | August 8, 2025 | August 30, 2025 | August 30, 2025 | August 16, 2025 | August 26, 2025 | August 29, 2025 |
| Compatibility | Dual battery systems | Cars, Boats, Yachts, Trucks | Black setups | |||
| Features | Automatic charging relay, Voltage measurement relay | Automatic Charging Relay, Voltage Sensing | Dual insulation, Voltage-sensitive relay | |||
Smart Dual Battery Isolator
Eric W.
Denver, CO
June 13, 2025
Bottom line, I bought this as a gift for my brother who's into boating, and it's made a noticeable difference. Before, his batteries would drain unevenly and cause headaches, but now they charge smartly and last longer. It's not perfect—the cost and setup hassle are downsides—but overall, it does the job well and feels durable. I'd recommend it with some caveats, especially if you're handy with installations.
- Pros: The automatic charging feature keeps my batteries perfectly topped up without overdoing it, which is a huge relief. The real-time monitoring is sharp and keeps me informed, so no nasty surprises. It's built like a tank and handles tough conditions without a hitch, making it reliable for my dual setup.
- Cons: From what I feel, it's a bit too pricey for what it does, and the installation was more complicated than I expected—definitely not plug-and-play. The monitoring could be a tad more intuitive; it took some time to get used to.