---
product_id: 314615755
title: "AC-DC 4.2V 2A Power Adaptor Lithium Battery Charger Single String Polymer Battery Charger 18650 Lithium Battery Charger Full Stop Automatically"
brand: "knacro"
price: "€ 3.61"
currency: EUR
in_stock: false
reviews_count: 1
url: https://www.desertcart.it/products/314615755-ac-dc-4-2v-2a-power-adaptor-lithium-battery-charger
store_origin: IT
region: Italy
---

# AC-DC 4.2V 2A Power Adaptor Lithium Battery Charger Single String Polymer Battery Charger 18650 Lithium Battery Charger Full Stop Automatically

**Brand:** knacro
**Price:** € 3.61
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** AC-DC 4.2V 2A Power Adaptor Lithium Battery Charger Single String Polymer Battery Charger 18650 Lithium Battery Charger Full Stop Automatically by knacro
- **How much does it cost?** € 3.61 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/314615755-ac-dc-4-2v-2a-power-adaptor-lithium-battery-charger)

## Best For

- knacro enthusiasts

## Why This Product

- Trusted knacro brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

NOTE: 1.Before buying, be sure to confirm that the interface size of this product matches with yours. Wrong size will not work!!! ( The interface size of this product is 5.5x2.1 mm). 2. This product has many kinds of protection functions, enter the protection mode, LED lights will flashing red light. When this happens, unplug the adapter immediately and check if the circuit is short-circuited, if the electrical power exceeds the rated power of the adapter, etc. Parameter: Input voltage: AC 110V / 220V (AC100-240V suitable for anywhere in the world voltage level). Output: DC 4.2V 2.0A. Output Wire length: 1m / 3.28ft. Output interface: 5.5 *2.1mm With over-current protection, over-discharge protection, over-voltage protection, overcharge protection, short circuit protection.（Enter Protection mode , with flashing red light）. Charging process LED indicator changes: 1. No-load status LED is green; 2. Charging, the first phase of constant current charging, LED indicator is red. Charge to the rated voltage into the second phase of constant voltage charging, the current slowly decreases. 3. When the battery power reaches 90-95%, LED lights turn green. At this point the charger will continue to charge with a small current until it is full. Package included: 1*4.2V 2A Power Adapter Li-ion Battery Charger

Review: It works just like the original. - It charges my floodlight just like the original.

## Features

- Output interface: 5.5 x 2.1mm (With built-in leaf spring, Compatible with 5.5x2.5 / 2.1mm ).Before buying, be sure to confirm that the interface size of this product matches with yours. Wrong size will not work! !!
- Output: DC 4.2V 2A (Suitable for 3.7V 4.2V 1-string Lithium Battery Pack)
- Output Wire length: 1m / 3.28ft.
- With over-current protection, over-discharge protection, over-voltage protection, overcharge protection, short circuit protection. (Enter Protection mode, with flashing red light)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08F24VVWQ |
| Customer Reviews | 4.3 4.3 out of 5 stars (2) |
| Date First Available | July 31, 2020 |
| Item Weight | 2.39 ounces |
| Manufacturer | KNACRO |
| Package Dimensions | 7.48 x 5.43 x 1.46 inches |

## Product Details

- **Amperage:** 2 Amps
- **Brand:** KNACRO
- **Compatible Devices:** Adapter, Led lights
- **Connector Type:** barrel connector
- **Included Components:** 1 x 4.2V 2A Power Adapter
- **Input Voltage:** 240 Volts
- **Number of Items:** 1
- **Special Feature:** Short Circuit Protection
- **Total USB Ports:** 1
- **Wattage:** 8.4 watts

## Images

![AC-DC 4.2V 2A Power Adaptor Lithium Battery Charger Single String Polymer Battery Charger 18650 Lithium Battery Charger Full Stop Automatically - Image 1](https://m.media-amazon.com/images/I/81cjteXpDpL.jpg)
![AC-DC 4.2V 2A Power Adaptor Lithium Battery Charger Single String Polymer Battery Charger 18650 Lithium Battery Charger Full Stop Automatically - Image 2](https://m.media-amazon.com/images/I/71GURt3hL0L.jpg)
![AC-DC 4.2V 2A Power Adaptor Lithium Battery Charger Single String Polymer Battery Charger 18650 Lithium Battery Charger Full Stop Automatically - Image 3](https://m.media-amazon.com/images/I/81FBRHUMZSL.jpg)
![AC-DC 4.2V 2A Power Adaptor Lithium Battery Charger Single String Polymer Battery Charger 18650 Lithium Battery Charger Full Stop Automatically - Image 4](https://m.media-amazon.com/images/I/81kRXuc9LLL.jpg)
![AC-DC 4.2V 2A Power Adaptor Lithium Battery Charger Single String Polymer Battery Charger 18650 Lithium Battery Charger Full Stop Automatically - Image 5](https://m.media-amazon.com/images/I/81p6HjrFCPL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ It works just like the original.
*by S***C on May 7, 2024*

It charges my floodlight just like the original.

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**Shop now:** [https://www.desertcart.it/products/314615755-ac-dc-4-2v-2a-power-adaptor-lithium-battery-charger](https://www.desertcart.it/products/314615755-ac-dc-4-2v-2a-power-adaptor-lithium-battery-charger)

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-03-15*