---
product_id: 320185682
title: "3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement"
brand: "hxjnldc"
price: "€ 47.90"
currency: EUR
in_stock: true
reviews_count: 13
category: "Hxjnldc"
url: https://www.desertcart.sk/products/320185682-3-7v-503040-battery-620mah-for-cozmo-vector-robot-battery
store_origin: SK
region: Slovakia
---

# 3.7V nominal, 4.2V full charge voltage 620mAh high-capacity power Built-in overcharge & short circuit protection 3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement

**Brand:** hxjnldc
**Price:** € 47.90
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your tech game—never miss a beat or a buzz!

## Quick Answers

- **What is this?** 3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement by hxjnldc
- **How much does it cost?** € 47.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/320185682-3-7v-503040-battery-620mah-for-cozmo-vector-robot-battery)

## Best For

- hxjnldc enthusiasts

## Why This Product

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

## Key Features

- • **Safety First, Always:** Equipped with Japanese Seiko IC protection board to prevent overcharge, overdischarge, overcurrent, and short circuits.
- • **Lightweight & Durable:** Weighing just 13g with high-temp resistant silicone cables, this battery keeps your devices powered without bulk.
- • **Universal Compatibility:** Perfect for 3.7-5V devices under 2.3Wh, including wireless speakers and FPV gear—upgrade your tech effortlessly.
- • **Power Your Favorite Gadgets:** 620mAh lithium polymer battery delivers reliable, long-lasting energy for your Cozmo Vector, SkyBell HD, and more.
- • **Precision Fit & Easy Replacement:** Compact 5×30×41mm size with genuine JST 2-pin connector ensures seamless DIY battery swaps without hassle.

## Overview

This 3.7V 503040 lithium polymer battery offers 620mAh capacity and 2.29Wh power in a compact 5×30×41mm form factor. Designed for seamless replacement in Cozmo Vector robots, SkyBell HD WiFi doorbells, and other 3.7-5V devices, it features advanced Japanese Seiko IC protection against overcharge, overdischarge, overcurrent, and short circuits. Lightweight at 13g and equipped with a genuine JST 2-pin connector, it’s the perfect DIY upgrade to revive and extend the life of your favorite electronics.

## Description

Product Description DC 3.7V Model Table of Square Rechargeable Polymer Lithium Battery (applicable to 3.7V-5V electronic products) Please carefully compare the polarity of the connector before use, the red wire is the positive "+" and the black wire is the negative "-"The yellow ( white) lead is a 'thermistor'，Do not reverse-charge or reverse-connectreverse. 3 -wi r e batteries retain red and black wires, which can replace 2 -wi r e batteries. The primary battery of some products has no plug or mismatched plug or mismatched polarity. It doesn't matter, you can cut and solder the plug directly or use our heat shrinkable insulating sleeve to connect the same color wire.

Review: Revived my headphones. Would recommend. - Used to replace my Sony XM4’s original battery that suddenly stopped working. Did exactly what I hoped and revived my favourite headphones.
Review: Replacement Battery - As described used to replace battery in a faulty corsair headset… only negative was battery comes with a connector and i had to solder to the board on the headset but no big deal… battery life much improved

## Features

- Compatible with COZMO Vector robot SkyBell HD WiFi Video Doorbell Flysight FPV Watch wireless speaker Battery replacement。Also suitable for DIY electronic products with 3.7-5V and less than 2.3Wh 620mAh built-in 2-wire battery replacement.（★ Not applicable to high-power electric tools and model aircraft）
- Please note that the specifications and polarity of the connector are based on the product display image,★the red wire is the positive "+" and the black wire is the negative "-"，Do not reverse-charge or reverse-connectreverse. ★The primary battery of some products has no plug or mismatched plug or mismatched polarity. It doesn't matter, you can cut and solder the plug directly or use our heat shrinkable insulating sleeve to connect the same color wire.
- 503040 rechargeable lithium ion polymer battery, nominal voltage 3.7V, full charge voltage 4.2V, capacity 620mAh, power 2.29Wh, ★size 5×30×41mm(0.197×1.181×1.598inch）(T*W*L), Weight:13g(0.46oz)，Maximum current:0.6A。 It can prevent overcharge, overdischarge, overcurrent, and short circuit.
- It‘s consists of of large-capacity A+ lithium battery, Japanese Seiko IC overcharge and overcurrent short circuit protection board, 3302-26 high temperature resistant silicone cable, and genuine JST Pitch1.25mm 2-pin connector module.
- If there are any quality issues within a year, ★please feel free to contact us via email for replacement.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08PKV564B |
| Amperage | 0.6 Amps |
| Antenna Location | Speaker |
| Battery Capacity | 620 Milliamp Hours |
| Battery Cell Type | Lithium Polymer |
| Battery Weight | 13 Grams |
| Battery capacity | 620 Milliamp Hours |
| Battery cell composition | Lithium Polymer |
| Best Sellers Rank | 306,429 in Toys & Games ( See Top 100 in Toys & Games ) 1,175 in Remote & App-Controlled RC Batteries |
| Brand | HXJNLDC |
| Brand Name | HXJNLDC |
| Country of Origin | China |
| Customer Reviews | 4.3 out of 5 stars 2,690 Reviews |
| Item Dimensions | 41 x 30 x 5 millimetres |
| Manufacturer | HXJN |
| Model Number | 503040 |
| Number of Batteries | 1 C batteries required. (included) |
| Number of batteries | 1 C batteries required. (included) |
| Product Warranty | 1 |
| Recommended uses for product | Speaker |
| Reusability | Rechargeable |
| UPC | 054114076826 |
| Unit Count | 1.0 count |
| Unit count | 1.0 count |
| Voltage | 3.7 Volts (DC) |

## Product Details

- **Battery capacity:** 620 Milliamp Hours
- **Battery cell composition:** Lithium Polymer
- **Brand:** HXJNLDC
- **Number of batteries:** 1 C batteries required. (included)
- **Recommended uses for product:** Speaker

## Images

![3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement - Image 1](https://m.media-amazon.com/images/I/61q7Lbqex6L.jpg)
![3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement - Image 2](https://m.media-amazon.com/images/I/71qZeb1kqsL.jpg)
![3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement - Image 3](https://m.media-amazon.com/images/I/81jSmvePDIL.jpg)
![3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement - Image 4](https://m.media-amazon.com/images/I/81ygEeonPJL.jpg)
![3.7V 503040 Battery 620mAh for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell Flysight FPV wireless speaker battery replacement - Image 5](https://m.media-amazon.com/images/I/616ocrZc8aL.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Revived my headphones. Would recommend.
*by C***R on 26 February 2026*

Used to replace my Sony XM4’s original battery that suddenly stopped working. Did exactly what I hoped and revived my favourite headphones.

### ⭐⭐⭐⭐⭐ Replacement Battery
*by K***R on 26 February 2026*

As described used to replace battery in a faulty corsair headset… only negative was battery comes with a connector and i had to solder to the board on the headset but no big deal… battery life much improved

### ⭐ Stopped working after 24 hrs
*by K***Y on 9 December 2025*

Bought for Anki Vector, Stopped working after 24hrs. Can’t return because you have to cut the wires to solder in to place

## Frequently Bought Together

- HXJNLDC DC 3.7V 620mAh 503040 Rechargeable Lithium Polymer Battery for Cozmo Vector Robot SkyBell HD WiFi Video Doorbell Flysight FPV Watch Wireless Speaker Battery Replacement
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**Shop now:** [https://www.desertcart.sk/products/320185682-3-7v-503040-battery-620mah-for-cozmo-vector-robot-battery](https://www.desertcart.sk/products/320185682-3-7v-503040-battery-620mah-for-cozmo-vector-robot-battery)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-07-27*