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

No. Lithium batterie$ need a $pecific charge controller. ($$$)

does the blue light stay on

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

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?

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.

Can I use this with a 200 amp alternator or will it hurt the unit

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.

Wirthco 20092 Battery Doctor 125 Amp 150 Amp Battery Isolator

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Description

⚡ Stay Powered, Stay Ahead – The Battery Doctor Your Ride Deserves!

SAFETY FIRST - Built-in overcurrent and surge protection safeguards sensitive electronic systems.
USER CONTROL - Manual override option gives you full control over starting battery charging when needed.
POWER PRIORITIZATION - Automatically prioritizes charging your starting battery for guaranteed vehicle readiness.
DUAL BATTERY MANAGEMENT - Seamlessly charges auxiliary batteries without manual intervention.
MARINE GRADE DURABILITY - IP62 water resistance ensures reliable performance even in wet, marine environments.

The Wirthco 20092 Battery Doctor is a robust 12V battery isolator delivering up to 150 amps, designed for marine and automotive use. Featuring IP62 water resistance, automatic priority charging, and advanced surge protection, it ensures optimal battery management and vehicle reliability. Trusted by thousands with a 4.3-star rating, it’s the smart choice for professionals who demand seamless power control and durability.

Specifications

ASIN	B0058SGDFK
Amperage	150 Amps
Best Sellers Rank	#5,555 in Automotive ( See Top 100 in Automotive ) #24 in Battery Chargers
Brand	WirthCo
Customer Reviews	4.4 4.4 out of 5 stars (680)
Date First Available	29 November 2012
Item Weight	431 g
Item model number	1213.1241
Manufacturer	Battery Doctor
Manufacturer Part Number	010054200929
Model	Battery Isolator, 125A
OEM Part Number	20092
Product Dimensions	12.95 x 14.48 x 5.84 cm; 430.91 g
Voltage	12 Volts

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Wirthco 20092 Battery Doctor 125 Amp/150 Amp Battery Isolator

Description

Specifications

Common Questions