---
product_id: 726700315
title: "DC 3.7V 800mAh 603040 Rechargeable Lithium-Ion Battery for Marshall MID Major II Major III Major IV Bluetooth Earphones and DIY 3.7-5V Electronics, Replacement Built-in 3-Wire Battery"
brand: "hxjnldc"
price: "₨1061833"
currency: LKR
in_stock: true
url: https://www.desertcart.lk/products/726700315-dc-3-7v-800mah-603040-rechargeable-lithium-ion-battery-marshall
store_origin: LK
region: Sri Lanka
---

# 3.7V Nominal Voltage 800mAh Capacity Overcharge & Short Circuit Protection DC 3.7V 800mAh 603040 Rechargeable Lithium-Ion Battery for Marshall MID Major II Major III Major IV Bluetooth Earphones and DIY 3.7-5V Electronics, Replacement Built-in 3-Wire Battery

**Brand:** hxjnldc
**Price:** ₨1061833
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your vibe with reliable, long-lasting energy!

## Quick Answers

- **What is this?** DC 3.7V 800mAh 603040 Rechargeable Lithium-Ion Battery for Marshall MID Major II Major III Major IV Bluetooth Earphones and DIY 3.7-5V Electronics, Replacement Built-in 3-Wire Battery by hxjnldc
- **How much does it cost?** ₨1061833 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/726700315-dc-3-7v-800mah-603040-rechargeable-lithium-ion-battery-marshall)

## 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

- • **Safe & Sound:** Built-in Japanese Seiko IC safeguards against overcharging, overcurrent, and short circuits.
- • **Precision Fit:** Compact 41x30x6mm size designed for seamless replacement in Major II, III & IV models.
- • **Power Your Sound:** High-capacity 800mAh battery keeps your Marshall earphones going longer.
- • **Plug & Play Flexibility:** 3-wire design with heat-resistant silicone cables for easy, secure installation.
- • **Universal Compatibility:** Works with any 3.7-5V electronics under 2.96Wh—perfect for your DIY projects.

## Overview

This 3.7V 800mAh rechargeable lithium-ion battery is tailor-made for Marshall MID, Major II, III, and IV Bluetooth earphones, offering a compact 41x30x6mm form factor and advanced safety features including overcharge and short circuit protection. Ideal for replacing worn-out batteries or powering other 3.7-5V electronics under 2.96Wh, it ensures your devices stay energized with dependable performance and easy installation.

## Description

Product description               Package: 603040 800mAh LiPo Battery x 1, Heat Shrink Insulation Sleeve x 1 Compatible with Marshall MID Major II Major III Major IV Bluetooth Earphone Battery Replacement It also works with other 3.7-5V electronic products with less than 2.96Wh (800mAh). (Not suitable for use with large electric tools or aircraft) Size: 1.6 x 1.2 x 0.2 inches (41 x 30 x 6 mm) (1.594 x 1.181 x 0.236 inches) (Length x Width x Thickness) Capacity: 800mAh Weight: 0.487oz Maximum Current: 0.8A                   Safety Warning               Please carefully compare the polarity of the connector before use. The red wire is the positive "+" and the black wire is the negative pole. Please do not reverse charge or connect the reverse connection. Do not use a leaky battery. Do not throw the battery into fire, water or get it wet. Do not strike the nail into the battery, hammer or step on the battery to avoid charging by fire or under direct sunlight               
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                    Legal Disclaimer               Please carefully compare the polarity of the connector before use. The red wire is the positive "+" and the black wire is the negative pole. Please do not reverse charge or connect the reverse connection. Do not use a leaky battery. Do not throw the battery into fire, water or get it wet. Do not strike the nail into the battery, hammer or step on the battery to avoid charging by fire or under direct sunlight             See more

## Features

- Compatible with Marshall MID Major II Major III Major IV Bluetooth Earphone Battery Replacement It also works with other 3.7-5V electronic products with less than 2.96Wh (800mAh). (Not suitable for use with large electric tools or aircraft)
- The specifications and polarity of the connector are based on the product image. The red line is the positive polarity "+", the black line is the negative polarity "-", and the white wire is the thermistor "NTC". Do not reverse charge or reverse connection. On some products, the original battery does not have a plug or the plug is not matched, or polarity mismatches. It's not a problem, you can directly cut the plug and weld it or use a heat shrink insulated sleeve to connect the same color wire
- 603040 Rechargeable Li-Po Battery, Nominal Voltage 3.7V, Full Charge Voltage 4.2V, Capacity 800mAh, Power 2.96Wh, Size:41*30*6mm(1.594*1.181*0.236inch)(L*W*T),Weight:13.7g (0.487oz),Max Current:0.8A It can prevent overcharging, over discharge, over current and short circuit
- Large Capacity A+Lithium Battery, Japanese Seiko IC Overcharge and Overcurrent Short Circuit Protection Board, 3302-26 Heat Resistant Silicone Cable, 3-Wire 3302-26 High Temperature Resistant Silicone Resin Cable Module
- If you have any quality problems within 1 year, please contact us by email for replacement

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Battery Power | 2.96 Milliamp Hours |
| Compatible Devices | Marshall MID, Marshall Major II, Marshall Major III, Marshall Major IV |
| Batteries Included | Yes |
| Batteries Required | Yes |
| Brand | HXJNLDC |
| Manufacturer | HXJN |
| Product Dimensions | 4.1 x 3 x 0.6 cm; 13 g |
| Item Weight | 13 Grams |

## Product Details

- **Number of Batteries:** 1 Lithium Polymer batteries required. (included)
- **Brand:** HXJNLDC
- **Battery Cell Composition:** Lithium
- **Battery Capacity:** 800 Milliamp Hours
- **Recommended Uses For Product:** Phone

## Images

![DC 3.7V 800mAh 603040 Rechargeable Lithium-Ion Battery for Marshall MID Major II Major III Major IV Bluetooth Earphones and DIY 3.7-5V Electronics, Replacement Built-in 3-Wire Battery - Image 1](https://m.media-amazon.com/images/I/611umL7ct+L.jpg)
![DC 3.7V 800mAh 603040 Rechargeable Lithium-Ion Battery for Marshall MID Major II Major III Major IV Bluetooth Earphones and DIY 3.7-5V Electronics, Replacement Built-in 3-Wire Battery - Image 2](https://m.media-amazon.com/images/I/61ZfRNKRNuL.jpg)
![DC 3.7V 800mAh 603040 Rechargeable Lithium-Ion Battery for Marshall MID Major II Major III Major IV Bluetooth Earphones and DIY 3.7-5V Electronics, Replacement Built-in 3-Wire Battery - Image 3](https://m.media-amazon.com/images/I/81jSmvePDIL.jpg)
![DC 3.7V 800mAh 603040 Rechargeable Lithium-Ion Battery for Marshall MID Major II Major III Major IV Bluetooth Earphones and DIY 3.7-5V Electronics, Replacement Built-in 3-Wire Battery - Image 4](https://m.media-amazon.com/images/I/81ygEeonPJL.jpg)
![DC 3.7V 800mAh 603040 Rechargeable Lithium-Ion Battery for Marshall MID Major II Major III Major IV Bluetooth Earphones and DIY 3.7-5V Electronics, Replacement Built-in 3-Wire Battery - Image 5](https://m.media-amazon.com/images/I/61ZYdXSCF5L.jpg)

## Frequently Bought Together

- HXJNLDC DC 3.7V 800mAh 603040 Rechargeable Lithium-ion Battery for Marshall MID Major II Major III Major IV Bluetooth Headphones VDL603040 SR603040
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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-04*