10 Best Dual Battery Kit of December 2025

• Buy before December 20th 2PM Pacific Time for Deliver before Christmas
• 1- True UTV-SBI-18 Isolator with silicon insulators and 3M Dual Lock fastner
• 1- 36mm blue led volt meter with dual rdisplay (requires 1- 29mm mounting hole), inludes 8' x 18ga duplex wire with connectors
• 1 ea- True 12" sealed 6ga Red and Black Cables with 6mm lugs
• 1- True 18" sealed 6ga Red Cable with 6mm lugs

True Amalgamated

• AFFORDABLE PARTS

Blue Sea Systems

• 4 AWG wire, fits 3/8" stud
• Tin plated 95% copper lugs for superior corrosion and oxidation resistance
• SAE 4 GAUGE COPPER
• Boat cable wire stays ultra flexible even in the most extreme conditions
• Heat-resistant up to 105C

CARTMAN

• This item can install to most of vehicle,for example Truck, SUV, RV, ATV, UTV, Boat and so on.
• Function: Cause your accessories to run from a separate battery while the engine is not working on your vehicle, and at the mean time holding your main battery charged and your vehicle always ready to work.
• This package is including 12 Volt 140 Amp Voltage Sensitive Relay Isolator and includes all other accessrioes.It is including instruction.
• It can work in dusty, wet and unexpected extreme weather condition.
• Warranty : We provide 6-month warranty,If you have any questions ,You can contact us and we will reply you within 24 hours

RANSOTO

• DUAL BATTERY ISOLATOR KIT - enables your accessories to run from a separate battery while the engine is not running on your vehicle while keeping your main battery charged and your vehicle always ready to go and start when you want it to. This dual battery isolator kit features 12 Volt 140 Amp Voltage Sensitive Relay Isolator and includes all the bits and pieces needed for a complete installation.
• FITS A WIDE VARIETY OF VEHICLES - Being the computer age that it is today, a lot of accessories, tools and gadgets that runs on electricity are essential in our everyday living or hobbies. This dual battery isolator kit with printed installation instruction manual gives you the power for your recreation without needing to worry about getting home after.
• COMPLETE KIT WITH PRINTED INSTALLATION MANUAL - This dual battery isolator kit manufactured by AA Ignition is a complete kit which includes the Isolator or Relay, battery Cables, battery terminals, copper lugs, heat shrinks, cable ties and a printed instruction manual.
• PREMIUM RUGGED CONSTRUCTION - This dual battery isolator kit is all you need to charge a dual battery system. It features a voltage sensitive chip ensuring your primary battery is always ready for your vehicle to run. This dual battery isolator is also built to withstand extreme weather environments, vibration and is water resistant.
• LIFETIME WARRANTY - This 12V 140 Amp dual battery isolator kit comes complete with a lifetime warranty. If the part ever fails on your Truck, SUV, RV, ATV, UTV or Boat simply contact us for a replacement. Avoid getting stucked after your recreation by purchasing this dual battery isolator kit from AA Ignition.

AA Ignition

• Completely pre-wired out of the box for a quick and easy installation
• Brackets are made of 1/8" aluminum so they will never rust, and all components are waterproof
• Severe duty 4ga welding cable
• Positive and Negative bus bars make it easy to add accessories that need battery power
• 100% Made in the USA by Genesis Offroad

Genesis Offroad

• Simplifies switching. Isolates engine and house circuits. Combines batteries for emergency starting
• Tin-plated copper studs for maximum conductivity and corrosion resistance
• 12/24 Volt DC 120 Amp Automatic Charging Relay (PN 7610) automatically combines batteries during charging. Isolates batteries during engine cranking and when not charging
• Includes E-series dual circuit plus battery switch (PN 5511E)
• Shares the charge between two batteries more efficiently than a battery isolator

Blue Sea Systems

• Cold Crank Amp (CCA)- 330
• Better warranty: Limited 3 and 4 year full replacement warranty - not pro rata
• Longer service life: With 3-10 years of service life, ODYSSEY batteries save consumers time, money, and aggravation
• Longer cycle life: 70 percentage longer cycle life compared to conventional deep cycle batteries, up to 400 cycles at 80 percentage depth of discharge- high stable voltage for longer periods of time
• Faster recharge: The highest recharge efficiency of any sealed lead battery on the market, capable of 100 percentage recharge in 4 - 6 hours.Reserve Capacity:52 minutes
• Mounting flexibility: Non-spillable design
• Vibration resistance- design protects against high impact shock and mechanical vibration
• Extreme temperature tolerant- Operating temperatures from -40 degree Celsius (-40 degree Fahrenheit) to 45 degree Celsius (113 degree Fahrenheit).
• This item is not for sale in Catalina Island / Pulse (5-second) Hot Cranking Amps (PHCA) - 900.This item cannot be returned and has additional shipping restrictions.Reserve Capacity Minutes 52

ODYSSEY

• ANY RETURNS AUTHORIZED BY AMAZON WILL NOT BE ACCEPTED
• 1- True UTV-SBI-18 Isolator with silicon insulators and 3M Dual Lock fastener
• 1- True 12 inch sealed Red 6ga Cable with two 6mm lugs
• 1- True 12 inch sealed Black 6ga Cable with two 6mm lugs
• 1- True 18 inch sealed Red 6ga Cable with two 6mm lugs

True Amalgamated

• Water resistant (IP62) - suitable for marine use
• Priority charging for starting battery
• Automatically charges auxiliary battery
• Manual override for starting battery
• Over current and surge protected for vehicles with electronic systems

WirthCo