Does the green knob need to be removed in order to disconnect the battery?

Not removed. Simply screw tight to engage battery use and loosen to disengage. The green knob can not fully be removed or misplaced.

What kind of metal is this made out of?

It is made of cast zinc, plated with a thin layer of a yellow metal that is similar to brass or bronze. Cast zinc can easily crack under stress as a few reviews mentioned it.

Should the be mounted on the positive terminal or the negative terminal?

Must be installed ONLY ON THE NEGATIVE terminal of the battery!!! The reason is safety. The positive terminal has a red plastic cover to protect against accidental shorts which can be very dangerous. The negative terminal does not have a plastic cover because if it shorts to a grounded metal part nothing would happen. If you install it on the positive terminal, you will have exposed metal that can accidentally be shorted. Hope my answer also provides the reasoning such that a user will understand the “why” not just the “how”.

If you have dual batteries do you need two switches

Yes, or choose 1-2-both-off switch: https://www.amazon.com/dp/B07PN9CT9H

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Ampper Top Post Battery Disconnect Switch 12V, Quick Disconnect Battery Cut Off Switch Battery Shut Off Kill Switch for Car (1 Pack)

Ampper Top Post Battery Disconnect Switch 12V, Quick Disconnect Battery Cut Off Switch Battery Shut Off Kill Switch for Car (1 Pack)

Product ID: 116362185

Details

Brand
Ampper
Connector Type
Clamp
Contact Type
Normally Open
Current Rating
125 Amps
Item dimensions L x W x H
3.3 x 1.5 x
Material
Brass

⚡12V DC system compatibility

🔋125A heavy-duty current rating

🔧Easy knob twist on/off control

€ 15.66

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Twist, Cut, Secure – Power Control Made Effortless

POWER CUT IN A TWIST - Quick knob-turn disconnects battery instantly, eliminating phantom drains.
UNIVERSAL TOP POST FIT - Fits standard 15-17 mm cone battery negative posts for cars, boats, RVs, and more.
SAFETY MEETS SIMPLICITY - Two-position ON/OFF switch isolates your battery to protect your vehicle’s electrical system.
COMPACT READY TO INSTALL - Lightweight 3.3” x 1.5” x 1.5” design for hassle-free panel mounting anywhere.
BUILT TO BRAVE THE ELEMENTS - Rust and corrosion-resistant brass construction ensures long-lasting durability.

The Ampper Top Post Battery Disconnect Switch is a robust 12V, 125A-rated kill switch designed for quick and easy battery isolation on vehicles, boats, and RVs. Featuring a corrosion-resistant brass build and a simple knob twist operation, it fits standard 15-17 mm top post terminals to prevent power drain and protect your electrical system with reliable, heavy-duty performance.

Specifications

ASIN	B07JYYXJH7
Best Sellers Rank	#21,410 in Automotive ( See Top 100 in Automotive ) #50 in Automotive Replacement Battery Switches
Brand Name	Ampper
Circuit Type	2-way
Color	Top Post
Compatible Devices	Car, Vehicle, RV, Boat, Electrical Equipment
Compatible with Vehicle Type	Compatible for Car, Vehicle, RV and Boat
Connectivity Protocol	X-10
Connector Type	Clamp
Contact Material	Stainless Steel
Contact Type	Normally Open
Control Method	Touch
Control Type	Power Supply Control
Current Rating	125 Amps
Customer Reviews	4.5 4.5 out of 5 stars (2,120)
International Protection Rating	IP65
Item Dimensions	3.3 x 1.5 x 1.5 inches
Item Weight	4.4 Ounces
Manufacturer	Ampper
Material Type	Brass
Model	Am-CBS21
Mounting Type	Panel Mount
Number of Positions	2
Operating Voltage	12 Volts
Operation Mode	ON-OFF
Part Interchange Info	metal
Part Number	Am-CBS21
Specification Met	UL
Switch Type	Kill Switch
Terminal	Top Post
Unit Count	1 Count
Wattage	1500 watts

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