True® Medium Dual Battery Kit – Under the hood kit
a compact and reliable dual battery solution designed for vehicles with limited engine bay space. It allows you to safely run accessories such as winches, lights, compressors, and fridges without draining your starting battery. The smart isolator automatically manages charging between the main and auxiliary batteries, ensuring dependable power for both starting and accessories. Ideal for off-road, 4WD, and work vehicles that need extra power under the hood.
Specification
| Attribute | Specification |
| Model | DBK12MEDIUM |
| Amperage Rating | 140 Amp |
| Voltage Compatibility | 12V DC Systems |
| Cut-In Voltage | 13.3V |
| Cut-Out Voltage | 12.8V |
| Waterproof Rating | IP65 Certified |
| Operating Temp | −30°C to 105°C |
Trusted by Leading Brands
A TRUE® exclusive!
Stay Charged, Stay Protected with TRUE® Smart Isolation
The unit will work to connect different types of batteries and keep them separated when there is no charging voltage available so that they do not “balance” and reduce each other efficiency like if they are paralleled without smart management.
Got a winch or plow you want to be serious about using but don’t want to worry about over working your alternator or discharging your primary battery? Then the TRUE® Medium Dual Battery Kit is exactly what you need.
Want to run those off road lights and high amp stereo without worrying about getting stranded? Then the TRUE® Medium Dual Battery Kit will handle the batteries for you!
As with all the TRUE products it features easy installation requiring no connection to the alternator or ignition.
All the TRUE kits include proprietary built cables that use special adhesive lined shrink tube to provide a fully waterproof corrosion -proof connection between cable and lug. The adhesive also provides the connection extra strength eliminating the possibility of the lug pulling off even in high stress and/or vibration applications. A TRUE exclusive!
Testimonials from Our Amazon Store
Ready to Install
Everything you need, right in the box. With detailed instructions and all hardware included, you’ll go from unboxing to fully mounted in no time. Simple, solid, and DIY-ready.
Heavy-Duty Wiring & Components
Frequently Asked Questions
1. What is P.E.P.® (Proprietary Efficiency Programming)?
- P.E.P.® is TrueAm’s smart logic that optimizes battery protection and charging efficiency.
- It ensures the isolator only connects when safe and beneficial for both batteries
2. Does it regulate charging amps?
- No, the SBI doesn’t regulate amperage. That’s handled by your alternator and voltage regulator.
- The SBI simply controls when the second battery is connected based on voltage thresholds.
3. How do I install it?
- DIY-friendly with waterproof cables, 3M Dual Lock™ fasteners, and clear wiring diagrams.
- Can be mounted on any clean flat surface—including directly on the battery case
4. Can I manually override or shut it off?
- The male connector underneath can be wired for remote shutoff.
- Inline switches are optional but not required—SBI handles disconnection automatically.
5. How do I monitor battery status?
- Optional Single Meter Dual Display (SMDD) shows real-time voltage for both batteries.
- Saves space and simplifies monitoring
6. What are the top off-road adventure destinations in the USA where dual battery setups and isolator kits are commonly used
- Moab, Utah
- Rubicon Trail, California
- Sand Hollow, Utah
- Johnson Valley, California
- Sedona, Arizona
- Glamis, California
- Hollister Hills, California
- Coconino Forest, Arizona
- White Rim Trail, Utah
- Ocotillo Wells, California
- Fordyce Jeep Trail, CA
- Hungry Valley, California
- Big Bear Lake, California
- Knik Glacier, Alaska
- Sawtooth Forest, Idaho
- Ouray, Colorado
- Silverton, Colorado
- Black Bear Pass, Colorado
- Imogene Pass, Colorado
- Black Hills, South Dakota
- Bighorn Forest, Wyoming
- Yankee Hill, Colorado
- Red Cone, Colorado
- Magruder Corridor, Idaho
- Custer Gallatin, Montana
- Pryor Mountains, Montana
- Tincup Pass, Colorado
- Silver Lake Dunes, Michigan
- Badlands Park, Indiana
- Drummond Island, Michigan
- Little Sahara, Oklahoma
- Gandy Dancer, Minnesota
- Dun-Good Trails, Wisconsin
- Bundy Hill, Michigan
- Appleton OHV, Minnesota
- SMORR, Missouri
- Hatfield-McCoy, WV
- Rausch Creek, Pennsylvania
- AOAA Park, Pennsylvania
- Windrock Park, Tennessee
- Uwharrie Forest, NC
- Brimstone, Tennessee
- Black Mountain, Kentucky
- GW Forest, Virginia
- Jericho Mountain, NH
- Reading Outdoors, PA
- Wildcat Park, Kentucky
- Ride the Wilds, NH
- Hidden Falls, Texas
- Ocala Forest, Florida
- Hot Springs Park, Arkansas
- Ozark-St. Francis, Arkansas
- Redneck Mud Park, Florida
- Barnwell Mountain, Texas
- Cape Lookout, NC
- Muddy Bottoms, Louisiana
- Durhamtown, Georgia
- Carolina Adventure, SC
- Big Bend Ranch, Texas
- Gulches ORV, South Carolina
William Florence –
Fixed my truck power problems. For the air bag system, I put two ahm batteries. There is no flickering of the electricity when compressors operate. My batteries are constantly fully charged thanks to this battery isolator.