---
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: "€ 21.10"
currency: EUR
in_stock: true
url: https://www.desertcart.ie/products/628798982-3-7v-503040-620mah-rechargeable-lithium-polymer-battery-suitable-cozmo
store_origin: IE
region: Ireland
---

# 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:** € 21.10
**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?** € 21.10 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/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

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

## 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 2.294Wh 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 2.294Wh, ★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 Pitch 1.25mm ★2 wire 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 |
| Batteries | 1 C batteries required. (included) |
| Customer Reviews | 4.4 4.4 out of 5 stars (982) |
| Date First Available | December 14, 2020 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.704 ounces |
| Item model number | 503040 |
| Manufacturer | HXJNLDC |
| Product Dimensions | 1.61 x 1.18 x 0.2 inches |

## Product Details

- **Number of batteries:** 1 C batteries required. (included)
- **Brand:** HXJNLDC
- **Battery cell composition:** Lithium Polymer
- **Battery capacity:** 620 Milliamp Hours
- **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/61q7Lbqex6L.jpg)

## 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
- PKCELL N Size 1.5V Alkaline Batteries, 10 Pack Ultra Long-Lasting MN9100/E90/LR1 Medical Battery for Medical Devices, GPS Trackers, Flashlights, Key Fobs, 10-Year Shelf Life
- Duracell N 1.5V Alkaline Battery, 2 Count Pack, N 1.5 Volt Alkaline Battery, Long-Lasting for Medical Devices, Key Fobs, GPS Trackers, and More

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ie/products/628798982-3-7v-503040-620mah-rechargeable-lithium-polymer-battery-suitable-cozmo](https://www.desertcart.ie/products/628798982-3-7v-503040-620mah-rechargeable-lithium-polymer-battery-suitable-cozmo)

---

*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-26*