Ampper Side Post Battery Disconnect Switch, 12–48V

Ampper’s side post battery disconnect switch is a manual on/off isolator intended for side-post batteries and electrical systems in cars, RVs, and boats. Its direct-fit design is aimed at installations using compatible 3/8-inch side-post terminals, without additional battery cables or lugs.

At a glance

The listing describes a direct connection to compatible side-post batteries, with no additional battery cables or lugs required.
Two on/off positions provide a manual way to disconnect the battery when a vehicle or boat is stored.
The product is stated to work with GM side-post batteries and other batteries using a 3/8-inch post terminal.

Price

$13.29Save 24%

Reference price: ~~$17.49~~

Price checked: Nov 13, 2026

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Pros and cons

Pros

Direct side-post attachment can simplify installation when the battery terminal matches the stated 3/8-inch specification.
Three distinct current ratings are provided for continuous, intermittent, and momentary operation at 12V DC.
Customer feedback highlights perceived fit and construction quality, including use on side-post batteries.

Technical specifications

22 specifications

Identity and electrical ratings
Brand	Ampper
Listed system range	DC 12 - 48 V systems
Continuous current at 12V DC	275 A continuous at DC 12V
Intermittent current at 12V DC	455 A intermittent at DC 12V
Momentary current at 12V DC	1250 A momentary at DC 12V
Rated wattage	3300 watts
Circuit type	1-way

Controls and connectivity
Operation mode	manual
Control methods listed	Touch
Switch type	Rotary
Number of positions	2
Wireless connection listed	X-10
Connector type	Push Button
Contact type	Normally Open

Compatibility and installation
Compatible batteries and equipment	Batteries with 3/8" post terminal, Electrical equipment
Mounting types listed	Surface Mount
Terminal type	Through Hole
Dimensions listed	5 x 1.8 x 2 inches
Weight listed	6 ounces

Materials and protection
Material listed	ABS Plastic
Contact material	Copper, Brass
International protection rating	IP65

What to know before buying

Listing details to confirm

The listing is inconsistent about control and switch details: it describes manual rotary on/off operation but also lists Touch control, a Push Button connector, X-10 connectivity, and Normally Open contacts. It gives a 12–48V system range while the listed operating voltage is 12 volts, and provides the 3300-watt figure without clarifying its applicable conditions. Confirm the intended configuration and ratings for your system before purchase. These are listing discrepancies, not established product defects.

Who is it for?

A good fit for

Owners of compatible GM or other 3/8-inch side-post batteries who want a manual battery disconnect for storage.
Car, RV, boat, or electrical-equipment installations whose system and current requirements match the listed ratings.

Less suited to

Batteries without compatible side-post terminals or installations that need a remote or automatic disconnect.
Buyers who need an unambiguous specification for voltage, controls, or power rating without confirming the listing details.

Ampper Side Post Battery Disconnect Switch, 12–48V · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 419 ratings

5 stars75%75%
4 stars14%14%
3 stars5%5%
2 stars1%1%
1 star5%5%

Customer feedback reports positive impressions of construction, fit, and battery-storage use, including a mention of keeping a boat charged during storage. Those comments describe customer perceptions rather than verified performance. The stated side-post fit and manual disconnect purpose make these reports relevant to buyers with compatible terminals, but the listing's control and voltage inconsistencies still warrant clarification.

Positive themes

Customer feedback describes the switch as well-constructed and reports good fit on side-post batteries.
Customers mention perceived value and use for maintaining boats during storage.

Frequently asked questions

Which battery terminals is this switch intended to fit?

The listing says it fits GM side-post batteries and other batteries with a 3/8-inch post terminal. Verify the terminal match before buying.

What current ratings are listed?

The listing specifies 275 A continuous, 455 A intermittent, and 1250 A momentary, each at DC 12V. These are different operating ratings, not interchangeable limits.

Does it work with 12–48V systems?

The title and feature text state use on DC 12–48V systems, while the technical details list an operating voltage of 12 volts. Confirm suitability for your system with the seller or manufacturer.

What is included?

The product description says the complete kit includes one battery switch and two SAE 3/8"-16 bolts. The separate package-content list is empty, so confirm the selected listing's contents.