# 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.

- [Original product page](https://best-deals.pro/product/ampper-side-post-battery-disconnect-switch)
- [View offer](https://best-deals.pro/visit/ampper-side-post-battery-disconnect-switch)
- Market: US
- Language: en-US
- Currency: USD
- Brand: Ampper
- Category: Cars & Motorcycles > Vehicle Accessories
- Price: 13.29 USD
- Previous price: 17.49 USD
- Discount: 24%
- Price checked: 2026-11-13T05:26:22.539Z
- Rating: 4.5 / 5
- Reviews: 419

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## 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.

## 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

## Before you buy

- 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.

## 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.

## Customer feedback

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.
- Positive themes: 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.

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## Add-ons

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## Images

![Ampper Side Post Battery Disconnect Switch, 12–48V — 1](https://best-deals.pro/i/XMejPOp6ap3LeHcQPapGNxHB3wgPVg2tD1c9_wLfMFHgbGeBLxjz2eabkCJEB_leEYRJUhfKA9E52-77-nNDKDfdwXqIgc26F0KCDBZppc9_ltNpBG8ak2n3.jpg)

![Ampper Side Post Battery Disconnect Switch, 12–48V — 2](https://best-deals.pro/i/4uVCHEaHDF35rsFk66rtZBfZ9SYnJZTPEOW9hMl1Nz9SF_6SeUiKhHSBjeL3MC26cTSRfEmXzRh-jLsPzIE4MjfB7ric-3QhMeM7a1BavAzg_c92ib9jAA8Y.jpg)

![Ampper Side Post Battery Disconnect Switch, 12–48V — 3](https://best-deals.pro/i/fMYbjR6woEdASTyaiTNhaqIlA73Ez5U4jmd1zO9bph2RKy9-OXb1772ekgd7FKMGmQsLcq3hkgeTP0cWEOdAX0T5smeZWvy3De49QfvcJTlPzDD0h-84JNgU.jpg)

![Ampper Side Post Battery Disconnect Switch, 12–48V — 4](https://best-deals.pro/i/OHTvKsNB6mU8Up_rYKo4K1UvT6adIUs2o2tKSPCWzkFLSXDzHb4xRpIBsJKQnHkCyUGJ1rnwj0qaC40DpClVH2fnzde524DURF_aZhVOhCllus1yQ0KDUkLi.jpg)

![Ampper Side Post Battery Disconnect Switch, 12–48V — 5](https://best-deals.pro/i/dY7oF6pl58JvpqBnKI-n26gpfEHNyOsKKCWoT8UsTnzeEBfgwDjh1bKlxCTSbECcj7Qq0YabMNlz46W9aP-yHzHzgWtlxaaQitcXQkC-MO2sd24mfsLrfH-4.jpg)

![Ampper Side Post Battery Disconnect Switch, 12–48V — 6](https://best-deals.pro/i/zDq7CsyDbNhO3S8x_LsntOsk6mscf90gxcRvtCObmqIkzSK9eYaJAXXy1koGakKApRK-EH0MJwdQxkyDsV5hDQ5aAeRWOqrf1c-G3ocWlF9YDOX5ZppPrCQB.jpg)

![Ampper Side Post Battery Disconnect Switch, 12–48V — 7](https://best-deals.pro/i/GcYw6boTk6_r7IcpNJMqokp3-jtdWmuKUGLxGy1RQp_p6ty1ssW0gFayOXI4DvXejIAEzdDBJ-IAwBCbQcWHXym1N75YKTeIU6GMG6JFndC1D-MhF_lF03pG.jpg)