---
product_id: 321203704
title: "DC 3.7V 3000mAh 103665 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement, Mobile Energy Storage Power Supply"
brand: "hxjnldc"
price: "$59.90"
currency: USD
in_stock: true
url: https://www.desertcart.ec/products/321203704-dc-3-7v-3000mah-103665-rechargeable-lithium-polymer-replacement-battery
store_origin: EC
region: Ecuador
---

# 3A max current output 3000mAh high capacity Built-in multi-protection IC DC 3.7V 3000mAh 103665 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement, Mobile Energy Storage Power Supply

**Brand:** hxjnldc
**Price:** $59.90
**Availability:** ✅ In Stock

## Summary

> 🔋 Power your passion, never run out of juice!

## Quick Answers

- **What is this?** DC 3.7V 3000mAh 103665 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement, Mobile Energy Storage Power Supply by hxjnldc
- **How much does it cost?** $59.90 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/321203704-dc-3-7v-3000mah-103665-rechargeable-lithium-polymer-replacement-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

- • **Compact Yet Mighty:** Slim 66×36×10mm form factor fits seamlessly into tight spaces without compromise
- • **Plug & Play or Customizable:** Includes genuine JST 2-wire connector with easy soldering options for perfect polarity alignment
- • **Long-Lasting Energy on the Go:** Generous 3000mAh capacity ensures extended runtime for your custom builds
- • **Safe & Smart Battery Management:** Integrated Japanese Seiko IC protects against overcharge, overdischarge, and short circuits
- • **Power Your DIY Projects with Confidence:** Reliable 3.7V lithium polymer battery tailored for versatile 3.7-5V electronics

## Overview

This 3.7V 3000mAh rechargeable lithium polymer battery is designed for DIY electronic projects requiring 3.7-5V power with up to 3A current. Featuring a compact 66×36×10mm size and weighing just 47.4g, it integrates a high-quality Japanese Seiko IC for comprehensive protection against overcharge, overdischarge, overcurrent, and short circuits. The battery comes with a genuine JST 2-wire connector and flexible wiring options, making it ideal for custom electronics, mobile energy storage, and replacement power supplies—backed by a 1-year quality guarantee.

## Description

DC 3.7V 3000mAh 103665 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement, Mobile Energy Storage Power Supply

## Features

- This battery is suitable for DIY electronic products with 3.7-5V and less than 11.1Wh 3000mAh 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.
- 103665 rechargeable lithium ion polymer battery, nominal voltage 3.7V, full charge voltage 4.2V, capacity 3000mAh, power 11.1Wh, ★size 66×36×10mm(2.6×1.417×0.393inch）(T*W*L), Weight:47.4g(1.676oz)，Maximum current:3A。 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, 3302-24 high temperature resistant silicone cable, and genuine JST Pitch 2.0mm ★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 |
|---------------|-------|
| Antenna Location | Power Tool, Watch, GPS |
| Item Weight | 51 Grams |
| Battery Weight | 47.3 Grams |
| Item Dimensions | 2.6 x 1.42 x 0.39 inches |
| Unit Count | 1 Count |
| Battery Cell Type | Lithium Polymer |
| Amperage | 3 Amps |
| Battery Capacity | 3000 Milliamp Hours |
| Reusability | Rechargeable |
| Voltage | 3.7 Volts (DC) |

## Product Details

- **Number of Batteries:** 1 Lithium Polymer batteries required. (included)
- **Brand:** HXJNLDC
- **Battery Cell Composition:** Lithium Polymer
- **Battery Capacity:** 3000 Milliamp Hours
- **Recommended Uses For Product:** GPS, Power Tool, Watch

## Images

![DC 3.7V 3000mAh 103665 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement, Mobile Energy Storage Power Supply - Image 1](https://m.media-amazon.com/images/I/61wvu-m0NbL.jpg)

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**Shop now:** [https://www.desertcart.ec/products/321203704-dc-3-7v-3000mah-103665-rechargeable-lithium-polymer-replacement-battery](https://www.desertcart.ec/products/321203704-dc-3-7v-3000mah-103665-rechargeable-lithium-polymer-replacement-battery)

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-23*