---
product_id: 644770547
title: "Replacement Charging Case Battery 702428 Compatible with Sony WF-1000XM4 WF1000XM4 Bluetooth Headset Battery with Tools"
brand: "e-yiiviil"
price: "S$46"
currency: SGD
in_stock: true
reviews_count: 2
category: "E Yiiviil"
url: https://www.desertcart.sg/products/644770547-replacement-charging-case-battery-702428-compatible-with-sony-wf-1000xm4
store_origin: SG
region: Singapore
---

# 3.85V optimized voltage 520mAh polymer power Includes installation tools Replacement Charging Case Battery 702428 Compatible with Sony WF-1000XM4 WF1000XM4 Bluetooth Headset Battery with Tools

**Brand:** e-yiiviil
**Price:** S$46
**Availability:** ✅ In Stock

## Summary

> 🔋 Recharge your vibe, not just your earbuds!

## Quick Answers

- **What is this?** Replacement Charging Case Battery 702428 Compatible with Sony WF-1000XM4 WF1000XM4 Bluetooth Headset Battery with Tools by e-yiiviil
- **How much does it cost?** S$46 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/644770547-replacement-charging-case-battery-702428-compatible-with-sony-wf-1000xm4)

## Best For

- e-yiiviil enthusiasts

## Why This Product

- Trusted e-yiiviil brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **DIY Ready Kit:** Comes with essential tools for a seamless, professional-grade battery replacement at home.
- • **Tested & Trusted:** Each battery is quality-tested before shipping to guarantee peak performance and peace of mind.
- • **Power Up Your Day:** 520mAh polymer battery ensures reliable, long-lasting charge for your Sony WF-1000XM4 case.
- • **Precision Voltage:** 3.85V output tailored for optimal headset charging performance without compromise.
- • **Support When You Need It:** Responsive customer service ready to assist within 24 hours, so you’re never left hanging.

## Overview

This brand-new 520mAh lithium polymer replacement battery is designed exclusively for the Sony WF-1000XM4 charging case, delivering a precise 3.85V output. It includes all necessary tools for easy installation, backed by quality testing and responsive customer support, making it the smart, cost-effective fix to keep your premium earbuds powered and ready.

## Description

Item details: Item number: 702428. Capacity: 520 mAh/2.0 Wh. Voltage: 3.85 V. Type: polymer. Packaging: 1 x battery, 1 x tools. Compatible with: Sony WF-1000XM4 WF1000XM4 Bluetooth Headset Charging Case Battery Note before purchase 1. Carefully check the model number of your device to see if this battery is compatible with your device. 2. A new Li-ion battery achieves its best performance after two or three full charge and discharge cycles. 3. When installing, make sure the plug is properly connected to your device. 4. Do not use a low-quality third-party adapter charger to charge your device as this will shorten the life of the battery. Contact us If you have any questions or have problems using our product, please send us a message, we will reply you within 24 hours. Thank you for your time.

Review: Easy fix - Worked great, solved the problem. Had all the tools I needed. And much cheaper than a case replacement. There is an iFixit guide for those who need it.
Review: Updated: works with WF-1000XM4 but doesn't hold charge - Update: this didn't hold charge but I have now discovered that resetting the charging case solved this problem on another replacement so that might be the solution. This is my third desertcart purchase trying to get a replacement case battery for my WF-1000XM4. One didn't charge, another charged but didn't hold charge and I thought I had hit the jackpot with this this one - sadly no. Looks identical to original battery and charges fine but doesn't hold charge for more than a day or so. Back to the drawing board.

## Features

- This battery is only compatible with Sony WF-1000XM4 WF1000XM4 Bluetooth headset charging case battery, the battery is brand new, all have been tested before shipping
- The instruments are no instructions, you can use the tutorial videos on YouTube and install it by yourself or a technician for help.
- A new Li-ion battery achieves the best performance after 2 - 3 cycles.
- If you have any questions with our product, please send us a message, show that you can solve your problems as quickly as we can, thank you for your patience.
- If you need professional installation technology, we are not liable for damage caused by improper operation.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D1V8VPPM |
| Antenna Location | Mobility Scooter |
| Battery Capacity | 520 Milliampere Hour (mAh) |
| Battery Cell Type | Polymer |
| Battery Weight | 0.1 Kilograms |
| Battery capacity | 520 Milliampere Hour (mAh) |
| Battery cell composition | Polymer |
| Best Sellers Rank | 710 in Mobile Phone Replacement Batteries |
| Brand | E-YIIVIIL |
| Brand Name | E-YIIVIIL |
| Country of Origin | China |
| Customer Reviews | 3.7 out of 5 stars 9 Reviews |
| Item Weight | 0.2 Kilograms |
| Manufacturer | Shenzhen DeRui Trading Limited Company |
| Number of Batteries | 1 Lithium Polymer batteries required. |
| Number of batteries | 1 Lithium Polymer batteries required. |
| Recommended uses for product | Mobility Scooter |
| Reusability | Rechargeable |
| Unit Count | 1.0 Count |
| Unit count | 1.0 Count |
| Voltage | 3.85 Volts |

## Product Details

- **Number of batteries:** 1 Lithium Polymer batteries required.
- **Brand:** E-YIIVIIL
- **Battery cell composition:** Polymer
- **Recommended uses for product:** Mobility Scooter
- **Voltage:** 3.85 Volts

## Images

![Replacement Charging Case Battery 702428 Compatible with Sony WF-1000XM4 WF1000XM4 Bluetooth Headset Battery with Tools - Image 1](https://m.media-amazon.com/images/I/71tRCLD2HZL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy fix
*by A***Y on 15 October 2025*

Worked great, solved the problem. Had all the tools I needed. And much cheaper than a case replacement. There is an iFixit guide for those who need it.

### ⭐⭐⭐ Updated: works with WF-1000XM4 but doesn't hold charge
*by S***R on 19 December 2024*

Update: this didn't hold charge but I have now discovered that resetting the charging case solved this problem on another replacement so that might be the solution. This is my third Amazon purchase trying to get a replacement case battery for my WF-1000XM4. One didn't charge, another charged but didn't hold charge and I thought I had hit the jackpot with this this one - sadly no. Looks identical to original battery and charges fine but doesn't hold charge for more than a day or so. Back to the drawing board.

## Frequently Bought Together

- E-yiiviil Replacement Charging Case Battery 702428 Compatible with Sony WF-1000XM4 WF1000XM4 Bluetooth Headset Battery with Tools
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**Shop now:** [https://www.desertcart.sg/products/644770547-replacement-charging-case-battery-702428-compatible-with-sony-wf-1000xm4](https://www.desertcart.sg/products/644770547-replacement-charging-case-battery-702428-compatible-with-sony-wf-1000xm4)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-02-14*