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

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

Product ID: 256924166

Details

Operation mode
ON-OFF
Current rating
125 Amps
Operating voltage
12 Volts
Contact type
Normally Open
Connector type
Clamp

🔋125A heavy-duty current rating

🔧Knob twist for quick disconnect

🛡️Solid brass corrosion-resistant build

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€ 28.24

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In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Twist, Disconnect, and Conquer Your Power Needs!

POWER CUT IN A TWIST - Effortlessly isolate your battery with a simple knob turn—no tools needed.
COMPACT LOCKABLE DESIGN - Space-saving 3.3" x 1.5" size with optional lock feature for added security and peace of mind.
ZERO POWER DRAIN GUARANTEE - Eliminate phantom battery drain when your vehicle or boat is parked—preserve battery life and reliability.
BUILT TO BRAVE THE ELEMENTS - Solid brass construction ensures rust-free, long-lasting durability for all your adventures.
UNIVERSAL FIT FOR TOP POST TERMINALS - Designed specifically for 15-17mm tapered negative battery posts—perfect for cars, boats, RVs, and ATVs.

The Ampper Top Post Battery Disconnect Switch is a robust 12V, 125A-rated master kill switch designed for quick and secure battery isolation. Featuring a corrosion-resistant solid brass knob, it fits 15-17mm tapered negative battery terminals, making it ideal for cars, boats, RVs, and ATVs. This easy-to-install switch prevents battery drain during inactivity, extends battery life, and enhances electrical system safety with a compact, lockable design.

Specifications

Manufacturer	Ampper
Brand	Ampper
Model	Am-CBS21
Product Dimensions	8.38 x 3.81 x 3.81 cm; 124.74 g
Item model number	Am-CBS21
Exterior	metal
Manufacturer Part Number	Am-CBS21
Special Features	disconnects the battery safely, eliminate any power draw from the battery when vehicle or boat is not in use, isolate and secure the electrical system, used for car battery systems, used for top post
Lift Type	ON-OFF
Voltage	12 Volts
Wattage	1500 watts
Item Weight	125 g

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