---
product_id: 556318460
title: "702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh"
brand: "exmumcmr"
price: "$48"
currency: NZD
in_stock: true
reviews_count: 8
category: "Exmumcmr"
url: https://www.desertcart.nz/products/556318460-702428-battery-compatible-with-sony-battery-for-wf-1000xm4-charging
store_origin: NZ
region: New Zealand
---

# 3.85V stable voltage output 100% original battery compatibility 520mAh high-capacity power 702428 Battery,Compatible with Sony Battery for WF-1000XM4 Charging Case P/N: LP702428 3.85v 520mAh

**Brand:** exmumcmr
**Price:** $48
**Availability:** ✅ In Stock

## Summary

> 🔋 Recharge your vibe, don’t replace your style!

## 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?** $48 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/556318460-702428-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

- • **Power Up Like New:** Restore your Sony WF-1000XM4 case with a fresh 520mAh Li-Polymer battery for extended playtime.
- • **DIY Upgrade Confidence:** Join savvy tech pros who easily swap batteries and revive their earbuds, avoiding costly replacements.
- • **Seamless Compatibility:** Engineered to perfectly fit and function with the original LP702428 battery model—no guesswork needed.
- • **Reliable Voltage Stability:** Consistent 3.85V output ensures your earbuds charge efficiently and maintain peak performance.
- • **Hassle-Free Warranty & Support:** Enjoy peace of mind with 12 months warranty plus 24/7 email support and a 60-day refund policy.

## Overview

This brand-new 3.85V, 520mAh Li-Polymer battery is a 100% compatible replacement for the Sony WF-1000XM4 charging case (model LP702428). Designed to restore your earbuds’ charging case to peak performance, it offers reliable voltage stability and long-lasting power. Backed by a 12-month warranty and 24/7 support, it’s the smart, cost-effective upgrade for professionals who demand uninterrupted audio excellence.

## 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: PERFECT!!! - 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: Solved my problem - 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.

## 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 |
| Antenna Location | Indoor/Outdoor |
| Battery Capacity | 520 Milliamp Hours |
| Battery Cell Composition | Lithium Ion |
| Battery Cell Type | Lithium Ion |
| Battery Weight | 0.1 Pounds |
| Best Sellers Rank | #61,808 in Electronics ( See Top 100 in Electronics ) #880 in Laptop Batteries |
| Brand | EXMUMCMR |
| Compatible Phone Models | WF-1000XM4 Charging Case |
| Customer Reviews | 4.5 out of 5 stars 41 Reviews |
| Manufacturer | FENGMAI LIMITED |
| Model Name | LP702428 |
| Number of Batteries | 1 Lithium Polymer batteries required. (included) |
| Recommended Uses For Product | Indoor/Outdoor |
| Reusability | Rechargeable |
| Unit Count | 1.0 Count |
| Voltage | 3.85 Volts |

## Product Details

- **Number of Batteries:** 1 Lithium Polymer batteries required. (included)
- **Brand:** EXMUMCMR
- **Battery Cell Composition:** Lithium Ion
- **Battery Capacity:** 520 Milliamp Hours
- **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)

## Customer Reviews

### ⭐⭐⭐⭐⭐ PERFECT!!!
*by T***N on August 13, 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!!!

### ⭐⭐⭐⭐⭐ Solved my problem
*by M***. on October 14, 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.

### ⭐⭐⭐⭐⭐ Works great with WH-XB910N Headphones
*by M***W on October 2, 2025*

I was having trouble finding replacement batteries for my WH-XB910N Sony Headphones. I let mine stay dead too long and it wouldn't charge, and then I got a replacement that was 550mAh instead of 520, but that wouldn't charge either (flashed orange for the "abnormal temp" warning). But then I popped this in and not only did the headphones turn on, but they charged! I'm so glad to have these back since they are still in like-new condition otherwise (body and pads are still in great shape).

## 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 New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-10*