---
product_id: 629175587
title: "DC 3.7V 800mAh 603040 Rechargeable Lithium Polymer Battery, Suitable for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement and LED Lights"
brand: "hxjnldc"
price: "€ 29.13"
currency: EUR
in_stock: true
reviews_count: 6
category: "Hxjnldc"
url: https://www.desertcart.fi/products/629175587-dc-3-7v-800mah-603040-rechargeable-lithium-polymer-battery-suitable
store_origin: FI
region: Finland
---

# 0.8A max current output 800mAh high-capacity power Built-in multi-protection IC DC 3.7V 800mAh 603040 Rechargeable Lithium Polymer Battery, Suitable for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement and LED Lights

**Brand:** hxjnldc
**Price:** € 29.13
**Availability:** ✅ In Stock

## Summary

> 🔋 Power your passion with precision and protection!

## Quick Answers

- **What is this?** DC 3.7V 800mAh 603040 Rechargeable Lithium Polymer Battery, Suitable for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement and LED Lights by hxjnldc
- **How much does it cost?** € 29.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/629175587-dc-3-7v-800mah-603040-rechargeable-lithium-polymer-battery-suitable)

## 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

- • **Lightweight & Compact:** Slim 6×30×41mm design weighing just 16g fits seamlessly into your sleekest electronic builds.
- • **Safe & Smart Charging:** Integrated Japanese Seiko IC protects against overcharge, overdischarge, overcurrent, and short circuits.
- • **Plug & Play Flexibility:** Comes with genuine JST 1.25mm 2-wire connector; easily customizable with heat shrink sleeves for perfect polarity.
- • **Power Up Your DIY Projects:** Compact 3.7V lithium polymer battery with 800mAh capacity for reliable, long-lasting energy.
- • **One-Year Worry-Free Replacement:** Quality guaranteed with responsive customer support and hassle-free replacement within 12 months.

## Overview

This DC 3.7V 800mAh 603040 rechargeable lithium polymer battery delivers a compact, lightweight power solution ideal for DIY electronics operating between 3.7-5V. Featuring a robust 0.8A max current and advanced Japanese Seiko IC protection, it ensures safe, efficient charging and discharging. The battery includes a genuine JST 2-wire connector for easy replacement or customization, making it perfect for hobbyists and professionals seeking reliable, long-lasting energy with peace of mind backed by a one-year warranty.

## Description

Buy DC 3.7V 800mAh 603040 Rechargeable Lithium Polymer Battery, Suitable for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement and LED Lights online on desertcart.ae at best prices. ✓ Fast and free shipping ✓ free returns ✓ cash on delivery available on eligible purchase.

Review: Replacement battery for Garmin Edge 520 - Use it to replace my battery in a Garmin Edge 520, perfect fit, and a bit more capacity then the original battery 800mAh vs 600mAh. The battery used about 30% on a 2,5 hour ride with 80% backlight on and Bluetooth connection.
Review: La batteria ricevuta è perfettamente conforme alla descrizione, funzionante

## Features

- This battery is suitable for DIY electronic products with 3.7-5V and less than 2.96Wh 800mAh 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.
- 603040 rechargeable lithium ion polymer battery, nominal voltage 3.7V, full charge voltage 4.2V, capacity 800mAh, power 2.96Wh, ★size 6×30×41mm(0.236×1.181×1.596inch）(T*W*L), Weight:16g(0.564oz)，Maximum current:0.8A。 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 | B09YQ2C1KR |
| Best Sellers Rank | #56,707 in Electronics ( See Top 100 in Electronics ) #469 in Rechargeable Household Batteries |
| Country of origin | China |
| Item model number | 603040 |
| Manufacturer | HXJN |
| Product Dimensions | 4.1 x 3 x 0.6 cm; 18.7 g |

## Product Details

- **Battery capacity:** 800 Milliamp Hours
- **Battery cell composition:** Lithium Polymer
- **Brand:** HXJNLDC
- **Number of batteries:** 1 C batteries required. (included)
- **Recommended uses for product:** Power Tool

## Images

![DC 3.7V 800mAh 603040 Rechargeable Lithium Polymer Battery, Suitable for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement and LED Lights - Image 1](https://m.media-amazon.com/images/I/61OCFCtcXgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Replacement battery for Garmin Edge 520
*by J***N on 2 April 2025*

Use it to replace my battery in a Garmin Edge 520, perfect fit, and a bit more capacity then the original battery 800mAh vs 600mAh. The battery used about 30% on a 2,5 hour ride with 80% backlight on and Bluetooth connection.

### ⭐⭐⭐⭐⭐ Review
*by S***E on 5 September 2025*

La batteria ricevuta è perfettamente conforme alla descrizione, funzionante

### ⭐⭐⭐⭐ Review
*by C***Z on 14 November 2024*

la batterie ok mais les connecteurs ne sont pas les mêmes que la batterie originale de mon modèle moteur turbo à double bobine 1/10 moteur turbofan acheté le 10/09/24

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**Shop now:** [https://www.desertcart.fi/products/629175587-dc-3-7v-800mah-603040-rechargeable-lithium-polymer-battery-suitable](https://www.desertcart.fi/products/629175587-dc-3-7v-800mah-603040-rechargeable-lithium-polymer-battery-suitable)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-11*