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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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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€ 217.33

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power up smart, stay charged longer!

COMPACT LIGHTWEIGHT - Weighing just 431g with a sleek 13x14x6 cm profile, it fits seamlessly into any vehicle setup without bulk.
SURGE PROTECTED SAFETY - Built-in overcurrent and surge protection safeguards your vehicle’s sensitive electronics from unexpected spikes.
MANUAL OVERRIDE CONTROL - Take charge anytime with manual override for your starting battery—total control at your fingertips.
MARINE GRADE DURABILITY - IP62 water resistance means no fear of splashes or rain—perfect for adventurous boaters and off-roaders alike.
SMART DUAL BATTERY MANAGEMENT - Automatically prioritizes your starting battery while efficiently charging your auxiliary battery for uninterrupted power.

The Wirthco 20092 Battery Doctor is a 150 Amp battery isolator designed for reliable dual battery management. Featuring IP62 water resistance, it’s ideal for marine and rugged environments. It prioritizes starting battery charging, automatically manages auxiliary battery power, and includes surge protection plus manual override for enhanced control and safety.

Specifications

ASIN	B0058SGDFK
Amperage	150 Amps
Best Sellers Rank	#12,014 in Automotive ( See Top 100 in Automotive ) #50 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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