---
product_id: 722750992
title: "702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh"
brand: "exmumcmr"
price: "€ 58.67"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.hr/products/722750992-702428-battery-compatible-with-sony-battery-for-wf-1000xm4-charging
store_origin: HR
region: Croatia
---

# 520mAh Capacity 3.85V Voltage 100% Compatible Replacement 702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh

**Brand:** exmumcmr
**Price:** € 58.67
**Availability:** ❌ Out of Stock

## Summary

> 🔋 Recharge your vibe, not just your earbuds!

## Quick Answers

- **What is this?** 702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh by exmumcmr
- **How much does it cost?** € 58.67 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/722750992-702428-battery-compatible-with-sony-battery-for-wf-1000xm4-charging)

## Best For

- exmumcmr enthusiasts

## Why This Product

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

## Key Features

- • **Long-Lasting Charge:** 520mAh capacity delivers extended playtime so you never miss a beat during your busy day.
- • **DIY Friendly Upgrade:** Easy to install battery swap that even occasional tinkerers can handle, keeping your earbuds fresh and powerful.
- • **Power Up with Precision:** Exact 3.85V voltage ensures seamless performance for your Sony WF-1000XM4 charging case.
- • **Plug & Play Compatibility:** 100% compatible with original battery model LP702428 for effortless, worry-free replacement.
- • **Hassle-Free Warranty & Support:** Enjoy peace of mind with 12 months warranty and 24/7 email support—because your tech deserves the best.

## Overview

This brand-new 3.85V, 520mAh Li-Polymer battery is a perfect, 100% compatible replacement for the Sony WF-1000XM4 charging case (model LP702428). Backed by a 12-month warranty and round-the-clock support, it offers a reliable, long-lasting power boost to keep your premium earbuds performing at their peak.

## Description

Specification: Type: Battery Model: 702428 Voltage: 3.85V Capacity: 520mAh Battery Type: Li-Polymer Battery Battery Condition: Brand New Replace Part Number: 702428 LP702428. Note: please make sure your BATTERY model before order. Thank you! Compatible Notebook: FOR Sony WF-1000XM4 Charging Case Package included: 1X Battery NOTE:If your WF-1000XM4 can not recognize the new battery, the battery cannot be fully charged or goes to 0% instantly，please change the laptop's Power Manager Charge Setting to the "Standard" mode， then discharge and recharge the battery 3-4 times. In this way， the battery may be recognized or recover to have a good capacit

Review: My earbuds were draining their battery like there was no tomorrow and figured with the help of iFixit I could handle a battery swap. I'm handy but ever rarely tinker with smaller technology, but this was a breeze and the battery fits perfectly and works as expected!!!
Review: la medida y voltaje del estuche de mis audifonos

## Features

- 100% Compatible with original battery.
- For battery part number:LP702428,702428
- Battery Voltage:3.85V Battery Capacity:520mAh,
- Compatible for Sony WF-1000XM4 Charging Case
- Warranty :Rest assured with 60 days Refund and 12 months Warranty;24 x 7 email support.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CGXT92VB |
| Guaranteed software updates until | unknown |
| Manufacturer | FENGMAI LIMITED |
| Package Dimensions | 12.6 x 8.1 x 2.21 cm; 32 g |

## Product Details

- **Battery capacity:** 520 Milliampere Hour (mAh)
- **Battery cell composition:** Lithium Ion
- **Brand:** EXMUMCMR
- **Number of batteries:** 1 Lithium Polymer batteries required. (included)
- **Recommended uses for product:** Indoor/Outdoor

## Images

![702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh - Image 1](https://m.media-amazon.com/images/I/61Y9mjf1cFL.jpg)
![702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh - Image 2](https://m.media-amazon.com/images/I/61VV2ekjRKL.jpg)
![702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh - Image 3](https://m.media-amazon.com/images/I/61UzHdL-mXL.jpg)
![702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh - Image 4](https://m.media-amazon.com/images/I/61+PZh0MVXL.jpg)
![702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh - Image 5](https://m.media-amazon.com/images/I/61YeWrOsPgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by T***N on 13 August 2025*

My earbuds were draining their battery like there was no tomorrow and figured with the help of iFixit I could handle a battery swap. I'm handy but ever rarely tinker with smaller technology, but this was a breeze and the battery fits perfectly and works as expected!!!

### ⭐⭐⭐⭐⭐ Review
*by C***N on 21 September 2025*

la medida y voltaje del estuche de mis audifonos

### ⭐⭐⭐⭐⭐ Review
*by M***. on 14 October 2024*

Own a pair of the XM4s that had battery issues. I know that there is a huge issue on these and a debate on what is causing charging issues. Some think it is firmware related. After my experience, I am convinced that it is the batteries and if the firmware plays a role, it is in how it changes the charging speed or some other variable. Of course this is a guess. For ref...My firmware was at 2.0.0, when my battery issues started. I was unable to get the buds to charge past 70%. Even at that, I was dealing with a flashing red case. I decided that the case battery had failed and swapped it out. Sure enough, the old case battery was swollen. It was clearly bad. I was surprised to see that the new case battery did not resolve the flashing red case issue. I could now get the buds to charge fully though. Even though I could now get the buds to fully charge, the right bud would die in 10 minutes. The left bud would die in about 15 or so minutes. I decided to also swap the batteries in the buds. And for those wondering.....it was not that bad of a job. The only real issue was...I could not get the cable to release after I lifted the black plastic latch...but it turns out that you can get the battery out without getting that cable loose. Now here is where the second Aha moment occurred during this repair. (The first was the flashing red light after the case battery was swapped) As I had never done a battery swap in an earbud before, I wanted to make sure that I had done things correctly before gluing the bud together. While testing it, I noticed that I was also getting totally different battery readings from my left earbud. Now keep in mind, I had not yet touched my left earbud. I had only swapped the battery in the case and the right earbud. This was interesting enough that I ran several test. And the left bud seems to have a significantly longer life than before. It was nothing like the right and the new battery....but much better than it had been. I then swapped the battery in the left earbud out too. I should note that I found the old batteries in both the left and right earbuds were slightly swollen. I have since upgraded to the 2.0.1 firmware on the new batteries. I now have weeks of using the buds and they operate like when they were new. There are no more charging issues at all. My takeaways... The interconnection between the case and between the buds is playing some role in the battery drain issue and confusing things. (Best guess....the right bud advises the battery level of both buds..and this is why it seems to drain 5%faster) You cant go by what the drain readings are telling you. It is entirely possible that the intercommunication is point you in the wrong direction. I now fully believe the issue is a battery issue....and the only way to truly clear the issue is to replace all 3. Yeah, the firmware may highlight the failing batteries...but if all 3 batteries are swollen, that is not software.

## Frequently Bought Together

- EXMUMCMR 702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh
- EXMUMCMR 𝟮𝟬𝟮𝟓 𝗡𝗲𝘄 𝗨𝗽𝗴𝗿𝗮𝗱𝗲𝘀 𝐙𝟓𝟓𝐇 𝐁𝐚𝐭𝐭𝐞𝐫𝐲,Compatible with Sony Headset Battery for WF-1000XM4(𝟐𝐏𝐂𝐒)+with Installation Tools Kit

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-15*