---
product_id: 368023282
title: "40A ESC 2-4S Brushless ESC Speed Controller 5V/3A BEC for F450 450mm S500 ZD550"
brand: "readytosky"
price: "₩114860"
currency: KRW
in_stock: null
reviews_count: 8
category: "Readytosky"
url: https://www.desertcart.kr/products/368023282-40a-esc-2-4s-brushless-esc-speed-controller-5v-3a
store_origin: KR
region: South Korea
---

# 40A continuous current rating 2-4S LiPo battery compatibility 5V/3A BEC output for stable power 40A ESC 2-4S Brushless ESC Speed Controller 5V/3A BEC for F450 450mm S500 ZD550

**Brand:** readytosky
**Price:** ₩114860
**Availability:** ❌ Out of Stock

## Summary

> 🚁 Elevate your drone game with power and precision!

## Quick Answers

- **What is this?** 40A ESC 2-4S Brushless ESC Speed Controller 5V/3A BEC for F450 450mm S500 ZD550 by readytosky
- **How much does it cost?** ₩114860 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/368023282-40a-esc-2-4s-brushless-esc-speed-controller-5v-3a)

## Best For

- readytosky enthusiasts

## Why This Product

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

## Key Features

- • **Power-Packed 40A ESC:** Delivers robust current for high-throttle performance without overheating
- • **Stable 5V/3A BEC Output:** Ensures reliable power supply to flight controllers and sensors, minimizing crashes
- • **Plug-and-Play Simplicity:** Highly intelligent and adaptive ESCs that are easy to install and use—no firmware flashing needed
- • **Lightweight & Compact Design:** Optimized size and weight to keep your drone agile and responsive
- • **Versatile 2-4S Battery Support:** Compatible with a wide range of LiPo batteries for flexible flight times

## Overview

The Readytosky 2-4S 40A Brushless ESC is a compact, lightweight electronic speed controller designed for 450mm quadcopters and helicopters. Supporting 2-4S LiPo batteries and featuring a stable 5V/3A BEC output, it delivers reliable power to motors and flight controllers. Its intelligent adaptive design ensures easy installation and smooth throttle response, making it a solid choice for drone enthusiasts seeking performance and stability.

## Description

Buy Readytosky 2-4S 40A Brushless ESC Electronic Speed Controller 5V/3A BEC for F450 450mm S500 ZD550 RC Helicopter Quadcopter(4PCS): Electric Speed Controllers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Very good quality - These readdytosky esc are just perfect for a drone with a 14 to 16 inch blade. There light weight for a 40a esc and work really well with high current motor you can have them give a boost amprig of 50a for to attest 10 second which is relly helpful when you have to going full throttle before you crash with out blowing of your esc. but what I really like Is the 2 capacitor that (look great quality also) they give a very stable current to power your othe drone parts like flightcontroller becouse it so stable you shouldn't have any problems with the sensor on the drone. there definitely a great price for the quality
Review: You may want to buy a different brand. - 3 of 4 just died, one smoked out. They just dropped dead in flight. I have 4 more on order but they will be returned for another brand.

## Features

- ★40A 2-4S Brushless ESC,BEC output: 5V 3A .
- ★The applicable number of battery cells :2-4S.
- ★Use for F450 450mm S500 ZD550 RC Helicopter Quadcopter.
- ★Highly intelligent, adaptive ability, extremely easy to use.
- ★★★Note: This ESC is not able to flash the firmware.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09G5S9YYG |
| Additional Features | Portable |
| Age Range Description | Baby |
| Are Batteries Required | Yes |
| Batteries are Included | No |
| Battery Description | Lithium-Ion Polymer |
| Best Sellers Rank | #178,584 in Toys & Games ( See Top 100 in Toys & Games ) #154 in Radio Control Vehicle Speed Controls |
| Brand Name | Readytosky |
| Color | Black |
| Customer Reviews | 3.6 out of 5 stars 58 Reviews |
| Included Components | [4 x 40A ESCs] |
| Manufacturer | Readytosky |
| Manufacturer Maximum Age (MONTHS) | 12 |
| Material Type | Plastic |
| Model Name | M15-4 |
| Model Number | M15-4 |
| Number of Items | 4 |
| Operation Mode | manual |
| Power Source | Battery Powered |
| Size | 7.2cm x 2.4cm |
| Theme | helicopter |
| Toy Vehicle Form | Helicopter |

## Images

![40A ESC 2-4S Brushless ESC Speed Controller 5V/3A BEC for F450 450mm S500 ZD550 - Image 1](https://m.media-amazon.com/images/I/91qWZqcI0yL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very good quality
*by G***I on February 16, 2023*

These readdytosky esc are just perfect for a drone with a 14 to 16 inch blade. There light weight for a 40a esc and work really well with high current motor you can have them give a boost amprig of 50a for to attest 10 second which is relly helpful when you have to going full throttle before you crash with out blowing of your esc. but what I really like Is the 2 capacitor that (look great quality also) they give a very stable current to power your othe drone parts like flightcontroller becouse it so stable you shouldn't have any problems with the sensor on the drone. there definitely a great price for the quality

### ⭐ You may want to buy a different brand.
*by M***K on November 29, 2025*

3 of 4 just died, one smoked out. They just dropped dead in flight. I have 4 more on order but they will be returned for another brand.

### ⭐⭐⭐⭐⭐ I received a replacement for one of the ESC
*by A***R on April 29, 2022*

One out of four didn’t work. Return date had expired . I received a replacement. I should have tested all four when received but waited until I had to install them in an airplane. The seller was very nice about the resolving the problem. Will buy from them again.

## Frequently Bought Together

- Readytosky 2-4S 40A Brushless ESC Electronic Speed Controller 5V/3A BEC for F450 450mm S500 ZD550 RC Helicopter Quadcopter(4PCS)
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- Readytosky 6Pairs 1045 Propellers CW CCW 10x4.5" FPV Props for F550 F450 S500 S550 FPV Quadcopter Multirotor

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**Shop now:** [https://www.desertcart.kr/products/368023282-40a-esc-2-4s-brushless-esc-speed-controller-5v-3a](https://www.desertcart.kr/products/368023282-40a-esc-2-4s-brushless-esc-speed-controller-5v-3a)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-03*