--- product_id: 7065661 title: "WirthCo Battery Doctor 20092 Dual Battery Isolator, 125/150 Amp, 12 Volt, Electronic Parallel Charging with Manual Override, IP62 Water Resistant, 4 x 4 x 2 Inch" brand: "wirthco" price: "€ 243.39" currency: EUR in_stock: true category: "Wirth Co" url: https://www.desertcart.hr/products/7065661-wirthco-battery-doctor-20092-dual-battery-isolator-125-150-amp store_origin: HR region: Croatia --- # 125A continuous charging power IP62 water-resistant housing Dual battery isolation & management WirthCo Battery Doctor 20092 Dual Battery Isolator, 125/150 Amp, 12 Volt, Electronic Parallel Charging with Manual Override, IP62 Water Resistant, 4 x 4 x 2 Inch **Brand:** wirthco **Price:** € 243.39 **Availability:** βœ… In Stock ## Summary > πŸ”‹ Power your journey with smart dual battery control β€” never get stranded again! ## Quick Answers - **What is this?** WirthCo Battery Doctor 20092 Dual Battery Isolator, 125/150 Amp, 12 Volt, Electronic Parallel Charging with Manual Override, IP62 Water Resistant, 4 x 4 x 2 Inch by wirthco - **How much does it cost?** € 243.39 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/7065661-wirthco-battery-doctor-20092-dual-battery-isolator-125-150-amp) ## Best For - wirthco enthusiasts ## Why This Product - Trusted wirthco brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Power-Packed Charging:** Delivers 125A continuous and 150A peak charging to keep your auxiliary battery ready for action. - β€’ **Compact & Versatile Design:** Sleek 4x4x2 inch electronic isolator fits anywhere with multiple mounting options and a lightweight build. - β€’ **Instant Jump-Start Override:** One push parallels batteries to jump-start your engine from the auxiliary battery when you need it most. - β€’ **Built Tough for Any Adventure:** IP62 water resistance plus surge and overcurrent protection make it perfect for marine, off-road, and daily drives. - β€’ **Seamless Dual Battery Control:** Automatically isolates your starting battery while charging the auxiliary, ensuring no power drain or cross-discharge. ## Overview The WirthCo Battery Doctor 20092 is a compact, electronic dual battery isolator designed for 12V systems, delivering 125A continuous and 150A peak charging. It automatically manages and isolates your starting and auxiliary batteries, includes a manual override for jump-starting, and features IP62 water resistance plus surge and overcurrent protection. Ideal for vehicles requiring reliable auxiliary battery charging in rugged or marine environments. ## Description The Battery Doctor 20092 is a fully automatic dual battery isolator from WirthCo, built to charge an auxiliary battery from a single alternator while keeping the starting battery isolated. Electronic switching control technology replaces bulky solenoid-style isolators in a compact 4 by 4 by 2 inch housing, and a single push of the override and reset button parallels both batteries so a charged auxiliary battery can be used to jump start the engine. Specifications: Part Number 20092; Voltage 12V; Charging Current 125 Amp continuous, 150 Amp peak; Charge Type Parallel; Control Electronic; Mounting Surface, firewall, or battery side; Voltage Drop None; Built-in surge protection; IP62 water resistance. For use with lead acid batteries (flooded, AGM, gel) and single auxiliary battery systems on negative ground alternator systems. Installation requires 6 AWG or larger wire and a 150 Amp fuse or circuit breaker at the auxiliary battery. Includes mounting bracket. Features include priority charging that fully charges the starting battery before paralleling the auxiliary battery, automatic charging once the starting battery is above 13.4 volts, overcurrent protection against short circuit damage, and surge protection for vehicles with electronic ignition and management systems. Suitable for use at home, in the workplace, on the road, in the campground, and on the water. ## Features - DUAL BATTERY MANAGEMENT - Automatically charges a 12 volt auxiliary battery from a single alternator while keeping the starting battery isolated, rated at 125 Amp continuous and 150 Amp peak for vehicles with an auxiliary battery. - MANUAL OVERRIDE JUMP START - A single push of the override and reset button parallels both batteries so a charged auxiliary battery can crank the engine when the starting battery is low, then returns to automatic charging once the engine starts. - COMPACT ELECTRONIC DESIGN - Uses electronic switching control technology in a 4 by 4 by 2 inch housing that is smaller and lighter than standard isolators, with surface, firewall, or battery-side mounting and an included mounting bracket - OVERCURRENT AND SURGE PROTECTED - Built-in surge protection and overcurrent protection guard the isolator and charging system in vehicles with electronic ignition systems, with no voltage drop. For use with lead acid flooded, AGM, and gel batteries. - WATER RESISTANT IP62 HOUSING - IP62 rated construction makes the isolator suitable for marine installations, and priority charging keeps the starting battery topped up before current is shared with the second battery. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0058SGDFK | | Amperage | 150 A | | Best Sellers Rank | #196,466 in Automotive ( See Top 100 in Automotive ) #744 in Battery Chargers | | Brand | WirthCo | | Customer Reviews | 4.5 4.5 out of 5 stars (699) | | Date First Available | June 30, 2011 | | Item Weight | 15.2 ounces | | Item model number | 1213.1241 | | Manufacturer | WirthCo | | Manufacturer Part Number | 010054200929 | | Model | Battery Isolator, 125A | | OEM Part Number | 20092 | | Product Dimensions | 5.1 x 5.7 x 2.3 inches | | Voltage | 12 volts | ## Images ![WirthCo Battery Doctor 20092 Dual Battery Isolator, 125/150 Amp, 12 Volt, Electronic Parallel Charging with Manual Override, IP62 Water Resistant, 4 x 4 x 2 Inch - Image 1](https://m.media-amazon.com/images/I/51m05s1r5gL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Can this be connected to a car battery then to a lithium battery pack for the purpose of keeping the lithium’s charged? Lithium for car amps** A: No. Lithium batterie$ need a $pecific charge controller. ($$$) **Q: does the blue light stay on** A: The blue light indicates that the primary battery is connected to the alternate battery and charging. This happens when (1) the vehicle's ignition is on and (2) the primary battery is being measured at 14V or higher. Also, after turning off the ignition there is a delay of less than a minute before the batteries are isolated. The blue light will remain on until completed **Q: i bought this three months ago. the battery continues to drain. always stays at 11.7 v. i dont know if thing is broken or what. what do i do?** A: I would not continue to let the batteries drain to 11.7 Volts. Never let you battery bank get lower then 11.9 Volts. I would replace your battery isolator. **Q: Can I use this with a 200 amp alternator or will it hurt the unit** A: This unto will work fine. Your alternator may be rated for 200 amps. That rating is right before is burns up. There are other loads in your car that will take power while it is running. There is no way your alternator will push 200 amps to your battery. ## Frequently Bought Together - WirthCo 1213.1241 20092 Battery Doctor 125 Amp/150 Amp Battery Isolator , Black - TKDMR 10pcs 1/0 AWG-3/8 Battery Lugs,Heavy Duty Wire Lugs,Ring Terminals,Battery Cable Ends,0 Guage terminals,Battery Terminal Connectors with 10pcs 3:1 Heat Shrink Tubing - Hamolar 3 Pack Car Audio 150 Amp Resettable Fuse Circuit Breaker Car Protect for Audio System Fuse 12-48V DC for Car Audio Amps Overload Protection Fuse --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/7065661-wirthco-battery-doctor-20092-dual-battery-isolator-125-150-amp](https://www.desertcart.hr/products/7065661-wirthco-battery-doctor-20092-dual-battery-isolator-125-150-amp) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-09-29*