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Rectangular black unit with silver terminals and a red manual override button, mounted on a metal bracket

Battery Doctor

Battery Doctor 20090 12-Volt Battery Isolator 100A Peak GPS accessory

SKU CH-G6JC-37R41

A 12-volt battery isolator with 100A peak rating, IP62 water resistance and smart monitoring that prioritises the starting battery while keeping an auxiliary battery charged

  • Product typeGPS Navigation Accessories
  • Key features? Water-resistant (IP62);? Suitable for marine use ;? Smart
  • Water-resistant IP62 rating protects against splashes and dust
  • Smart monitoring keeps auxiliary battery charged automatically
  • Priority charging ensures starting battery gets power first
  • 100 A peak capacity handles high-current demands
  • Manual override links both batteries for emergency starting

Dual-battery management for 12 V systems

The Battery Doctor 20090 isolates a starting battery from an auxiliary battery in 12-volt vehicles and boats. Smart circuitry monitors the auxiliary battery and keeps it charged while giving the starting battery priority. Overcurrent and surge protection guard sensitive vehicle electronics during charging cycles.

Sustained operation and protection

Under continuous load the isolator draws only 300 mA in standby and limits peak throughput to 100 amps. Priority logic ensures the starter battery recovers first before the auxiliary bank accepts charge. Water-resistant IP62 construction resists spray and humidity so the unit maintains its protective function during extended marine or off-road use.

Mounting and manual override

A supplied bracket secures the isolator in engine compartments or bilge areas. A manual override button parallels both batteries for emergency starting when the primary bank is depleted. Charge rate follows alternator output so wiring and fuse selection must match the vehicle's own generating capacity.

How it compares

Measured against everything we stock in GPS Mounts & Accessories, at today’s prices. Recalculated every night.

Price $79.99
Pricier than about 91% of the 716 comparable items (median $14.99).

Specifications

Product
Brand nameBATTERY DOCTOR
Product typeGPS Navigation Accessories

Questions about this item

How much power does the 20090 isolator draw when the engine is off?

The unit draws 300mA in standby mode, so the auxiliary battery will not be drained excessively while the vehicle sits parked.

What electrical system must the vehicle already have for this 12-Volt isolator to function?

A 12-volt alternator and starting battery are required; the isolator connects to them and manages charging of an auxiliary battery automatically.

Will the IP62-rated housing survive splashes in an older boat or 4x4?

Yes, the IP62 rating means the housing is water-resistant and designed for marine use, so spray and condensation in older craft are not a problem.

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