---
product_id: 628798982
title: "3.7V 503040 620mAh Rechargeable Lithium Polymer Battery, Suitable for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell、Flysight FPV Watch、 wireless speaker Battery replacement"
brand: "hxjnldc"
price: "118.37 DT"
currency: TND
in_stock: true
reviews_count: 5
category: "Hxjnldc"
url: https://www.desertcart.tn/products/628798982-3-7v-503040-620mah-rechargeable-lithium-polymer-battery-suitable-cozmo
store_origin: TN
region: Tunisia
---

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

**Brand:** hxjnldc
**Price:** 118.37 DT
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your tech game with smart, safe, and sleek energy!

## Quick Answers

- **What is this?** 3.7V 503040 620mAh Rechargeable Lithium Polymer Battery, Suitable for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell、Flysight FPV Watch、 wireless speaker Battery replacement by hxjnldc
- **How much does it cost?** 118.37 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/628798982-3-7v-503040-620mah-rechargeable-lithium-polymer-battery-suitable-cozmo)

## 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:** Japanese Seiko IC safeguards against overcharge, overcurrent, and short circuits.
- • **Lightweight Yet Mighty:** Only 13g, delivering powerful performance without bulk—ideal for portable gadgets.
- • **Plug & Play with Confidence:** Genuine JST 1.25mm 2-wire connector with heat shrink sleeve for secure, easy installation.
- • **Precision Fit for DIY Innovators:** Compact 5×30×41mm size fits perfectly in a variety of 3.7-5V electronics.
- • **Power Your Smart Devices Seamlessly:** 620mAh capacity ensures long-lasting energy for your Cozmo Vector, SkyBell, and more.

## Overview

This 3.7V 620mAh rechargeable lithium polymer battery is engineered for reliable replacement in Cozmo Vector robots, SkyBell HD WiFi video doorbells, Flysight FPV watches, and wireless speakers. Featuring a compact 5×30×41mm form factor and weighing just 13g, it delivers 2.294Wh of power with built-in Japanese Seiko IC protection against overcharge, overcurrent, and short circuits. Designed for DIY enthusiasts and professionals alike, it includes a genuine JST 1.25mm 2-wire connector and heat shrinkable insulating sleeve for safe, easy installation. Backed by a 1-year quality guarantee, this battery ensures your smart devices stay powered and protected.

## Description

Product description DC 3.7V Model Table of Square Rechargeable Polymer Lithium Battery (applicable to 3.7V-5V electronic products) Please note that connector specifications and polarity are based on the product display image ,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 -wire batteries retain red and black wires, which can replace 2 -wire batteries. Some products' original batteries may lack plugs, have incompatible plugs, or exhibit mismatched polarity. No worries—you can simply cut the wires and use the included heat-shrink tubing to connect the wires of the same color from the old plug. Package: 620mAh LiPo battery x 1 heat shrinkable insulating sleeve x 1 Compatible ： COZMO Vector robot、 SkyBell HD WiFi Video Doorbell、Flysight FPV Watch、 wireless speaker It can also be used for MP3, MP4, MP5, GPS, smart watches, power packs, detectors, More Other 3.7~5V electronic products with power less than 2.29Wh (620mAh). Size: 1.596×1.181×0.196inch (L*W*T) Size: 41×30×5mm (L*W*T) voltage: 3.7V Capacity: 620mAh Weight: 0.458oz（13g) Maximum current: 1A

Review: Cumple lo que promete - Una batería pequeña apta para los robots de Anki Cozmo y Vector. En mi caso fue para un Cozmo al que la batería que venía de fábrica no aguantaba ya la carga y era necesario reemplazarla. La batería viene con un conector JST típico en baterías y un pequeño trozo de tubo termorretráctil (que no utilicé). Buena calidad y mayor capacidad que la batería que venía de fábrica con Cozmo. Eso sí, si os aventuráis a desmontar a Cozmo, tened en cuenta que, aunque es relativamente sencillo, hay que hacerlo con cuidado, y la batería tiene que ser soldada a la placa. En cualquier caso, la batería de momento cumple bastante bien y aún no he tenido que cargarla desde que se la coloqué al robot.
Review: Works Great in Cozmo - Works great in Cozmo toys. Perfect fit. Installation isn't too hard but does require some time and patience. See the picture here of my son's Cozmo torn down to the point where the battery can be replaced. It looks like a lot of pieces but everything disassembles easily and goes back together pretty easy too. The head is a little tricky as there is a small spring that you have to fight as you put it together, but isn't too hard once you figure it out. Sort of like a puzzle. There is a video on YouTube by John that is super helpful. Just watch that once and you'll have it figured out. The hardest part for most people will be just soldering the wires to the circuit board. This battery comes with a JST plug, but you have to cut that off, strip the wires, and then solder them to the board. It's pretty trivial if you know how to solder, but could trip up people who've never used a soldering iron. You'll need to cut the red wire shorter and leave the black wire longer, since the leads come out the same side of the battery, so it's close to the positive tab on the board, but the negative soldering tab is on the other side. Anyway, so far so good. Cozmo is up and running for last few days now with no issues. Haven't timed the battery life, but so far it lasts longer than my son's interest in it for any given moment. Note that it charges quite fast too. So you can play with this thing off and on all day long as long as you park Cozmo on his home charger between plays. Can recommend this battery. And watch John's tutorial too. Happing fixing!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Battery capacity | 620 Milliamp Hours |
| Battery cell composition | Lithium Polymer |
| Brand | HXJNLDC |
| Number of batteries | 1 C batteries required. (included) |
| Recommended uses for product | Doorbell, GPS, MP3 Player, Radio, Speaker, Toys, Watch |
| 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:** Doorbell, GPS, MP3 Player, Radio, Speaker, Toys, Watch

## Images

![3.7V 503040 620mAh Rechargeable Lithium Polymer Battery, Suitable for cozmo Vector robot Battery replacement,SkyBell HD WiFi Video Doorbell、Flysight FPV Watch、 wireless speaker Battery replacement - Image 1](https://m.media-amazon.com/images/I/61HDn2M23KL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Cumple lo que promete
*by A***N on 4 February 2024*

Una batería pequeña apta para los robots de Anki Cozmo y Vector. En mi caso fue para un Cozmo al que la batería que venía de fábrica no aguantaba ya la carga y era necesario reemplazarla. La batería viene con un conector JST típico en baterías y un pequeño trozo de tubo termorretráctil (que no utilicé). Buena calidad y mayor capacidad que la batería que venía de fábrica con Cozmo. Eso sí, si os aventuráis a desmontar a Cozmo, tened en cuenta que, aunque es relativamente sencillo, hay que hacerlo con cuidado, y la batería tiene que ser soldada a la placa. En cualquier caso, la batería de momento cumple bastante bien y aún no he tenido que cargarla desde que se la coloqué al robot.

### ⭐⭐⭐⭐⭐ Works Great in Cozmo
*by D***. on 24 July 2021*

Works great in Cozmo toys. Perfect fit. Installation isn't too hard but does require some time and patience. See the picture here of my son's Cozmo torn down to the point where the battery can be replaced. It looks like a lot of pieces but everything disassembles easily and goes back together pretty easy too. The head is a little tricky as there is a small spring that you have to fight as you put it together, but isn't too hard once you figure it out. Sort of like a puzzle. There is a video on YouTube by John that is super helpful. Just watch that once and you'll have it figured out. The hardest part for most people will be just soldering the wires to the circuit board. This battery comes with a JST plug, but you have to cut that off, strip the wires, and then solder them to the board. It's pretty trivial if you know how to solder, but could trip up people who've never used a soldering iron. You'll need to cut the red wire shorter and leave the black wire longer, since the leads come out the same side of the battery, so it's close to the positive tab on the board, but the negative soldering tab is on the other side. Anyway, so far so good. Cozmo is up and running for last few days now with no issues. Haven't timed the battery life, but so far it lasts longer than my son's interest in it for any given moment. Note that it charges quite fast too. So you can play with this thing off and on all day long as long as you park Cozmo on his home charger between plays. Can recommend this battery. And watch John's tutorial too. Happing fixing!

### ⭐⭐⭐⭐⭐ Batterie cozmo Fils a soudé
*by C***R on 18 May 2026*

Parfait , effectivement en lisant les commentaires avant, la batterie est un peu grande pour le petit robot cozmo mais elle rentre en forçant légèrement et les deux fils doivent être soudé et c’est niquel ;)

## Frequently Bought Together

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-06-24*