---
product_id: 599981312
title: "2X Pack Z55H 3.85V 70mAh Battery Replacement for Sony WF1000XM4 WF-1000XM4 Industry Leading Noise Canceling Truly Wireless Earbud Headphones Battery+ Tools"
brand: "exmumcmr"
price: "€ 109.80"
currency: EUR
in_stock: true
reviews_count: 5
category: "Exmumcmr"
url: https://www.desertcart.com.cy/products/599981312-2x-pack-z55h-3-85v-70mah-battery-replacement-for-sony
store_origin: CY
region: Cyprus
---

# 70mAh Capacity 3.85V Voltage 2-Pack + Installation Tools 2X Pack Z55H 3.85V 70mAh Battery Replacement for Sony WF1000XM4 WF-1000XM4 Industry Leading Noise Canceling Truly Wireless Earbud Headphones Battery+ Tools

**Brand:** exmumcmr
**Price:** € 109.80
**Availability:** ✅ In Stock

## Summary

> 🔋 Recharge your earbuds, reclaim your sound — DIY power with pro precision!

## Quick Answers

- **What is this?** 2X Pack Z55H 3.85V 70mAh Battery Replacement for Sony WF1000XM4 WF-1000XM4 Industry Leading Noise Canceling Truly Wireless Earbud Headphones Battery+ Tools by exmumcmr
- **How much does it cost?** € 109.80 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/599981312-2x-pack-z55h-3-85v-70mah-battery-replacement-for-sony)

## 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

- • **Precision Fit:** Exact dimensions (D5.5 x W12 mm) ensure 100% compatibility with original Sony Z55H batteries.
- • **Double the Value:** Get two premium replacement batteries plus a professional-grade tool kit for seamless DIY installation.
- • **Eco-Smart Upgrade:** Extend your earbuds’ lifespan and reduce electronic waste by replacing batteries instead of buying new earbuds.
- • **Power Up Like New:** Restore your Sony WF-1000XM4 earbuds to factory-level battery life with 3.85V, 70mAh cells.
- • **Confidence Guaranteed:** Backed by 12 months warranty and 60-day refund policy with 24/7 expert email support.

## Overview

This 2-pack Z55H battery replacement kit offers 3.85V, 70mAh capacity batteries specifically designed for Sony WF-1000XM4 earbuds. It includes professional tools for easy installation, ensuring perfect fit and restoring original battery performance. With a 12-month warranty and 60-day refund, it’s the smart, eco-friendly solution to extend your earbuds’ life and avoid costly replacements.

## Description

Specification: Item: Z55H Battery  Voltage: 3.85V Capacity:70mAh  Condition: 100% New from Manufacturer,  Compatible Part Numbers: Z55H CP1254 Compatible with Models: for Sony WF1000XM4 WF-SP900 Bluetooth Headset Includes:2PCSX batteries.+ tools

Review: Las súper recomiendo. Duran más que las originales, por mucho. Es complicado instalarlas, pero eso no es culpa del producto, sino de los audífonos.
Review: Full transparency, I'm only 2 weeks or so into the swapping out of the batteries and I haven't had a chance to use the earbuds heavily since then. I'll update accordingly if things change. Pros: - Price is inexpensive - The kit they send to help with the replacement is a great touch. I saved the kit after I was done and plan on using it for other things in the future. Nice bonus. - About 2-3 weeks in, the batteries seem to be working very well and have restored the right earbud to as it was from the factory. Time will tell how long they hold up, but I'm optimistic. Cons: - None regarding the batteries and kit that were part of this purchase. What to watch out for: - Don't apply too much heat to the earbud you want to disassemble. Turning the earbud in your fingers while applying heat from a heat gun or hair dryer should do the trick. Apply even heat for 10-15 seconds and see if you can pop the housing apart. - I used a paper towel for cushion, applied pressure via a pair of pliers with the paper towel under the teeth of the pliers, and the case started to separate perfectly. Please use very little force when attempting to separate the halves this way as too much pressure could damage the earbud or mar the plastic surface. - When working on the replacement, be careful not to damage any of the ribbon cables inside the earbud. - To separate the circuit board from the top of the battery, I applied heat very briefly, followed by a back-and-forth motion with the included guitar pick looking tool until the circuit board was free from the top of the battery. - Removing the battery can be a bit difficult as it has a type of glue that helps keep it secure. Try to work around the edges of the OEM battery to fee it from this glue. You could also apply heat in short intervals until it loosens as well. - Make sure you drop the new battery into the earbud with the correct polarity facing upwards. - Reassemble in the reverse and you should be good to go. Charge the earbud(s) and test things out. I was a victim of the bad batch of batteries that Sony put into their earlier production of the WF-1000XM4 earbuds. After about 2 years of occasional use, and a firmware update in mid to late 2024, my right earbud would never charge past 95% and when in use, the right earbud battery would maybe last 30 minutes. I was less than pleased after having spent a considerable amount on these earbuds about 2 years or so ago from the time this started happening. I lived with it, opting to use my over the ear headphones for my long flights and didn't think much of it, other than vowing to never give Sony another chance on earbuds, I love their over the ear noise cancelling headphones though. In searching for this issue, I found this battery kit and decided to give it a try. What's the worst that could happen, the right side works 0 minutes versus 30 minutes? I used a YouTube video for the disassembly, removal of OEM battery, installing the new battery, and reassembly. I used a Milwaukee heat gun, and the glue softened quickly but a hairdryer would work as well. Took about 5-10 minutes per earbud, I replaced both so they would both have new batteries, and so far, all is working very well.

## Features

- 100% Compatible with original battery.
- Battery Voltage:3.85V Battery Capacity:70mAh， For battery part number:Z55H CP1254
- Actual measured dimensions (mm): D5.5 x W12
- Compatible for WF-1000XM4 WF1000XM4
- Warranty :Rest assured with 60 days Refund and 12 months Warranty;24 x 7 email support.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C62L2FTV |
| Best Sellers Rank | #65,780 in Electronics ( See Top 100 in Electronics ) #3,464 in In-Ear Headphones |
| Item model number | Z55H |
| Manufacturer | FENGMAI LIMITED |

## Product Details

- **Battery capacity:** 750 Milliamp Hours
- **Battery cell composition:** Lithium Ion
- **Brand:** EXMUMCMR
- **Number of batteries:** 1 Lithium Ion batteries required. (included)
- **Recommended uses for product:** WF1000XM4 Headphones

## Images

![2X Pack Z55H 3.85V 70mAh Battery Replacement for Sony WF1000XM4 WF-1000XM4 Industry Leading Noise Canceling Truly Wireless Earbud Headphones Battery+ Tools - Image 1](https://m.media-amazon.com/images/I/71ngp8LSsXL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by N***S on 13 January 2026*

Las súper recomiendo. Duran más que las originales, por mucho. Es complicado instalarlas, pero eso no es culpa del producto, sino de los audífonos.

### ⭐⭐⭐⭐⭐ Review
*by F***4 on 15 April 2025*

Full transparency, I'm only 2 weeks or so into the swapping out of the batteries and I haven't had a chance to use the earbuds heavily since then. I'll update accordingly if things change. Pros: - Price is inexpensive - The kit they send to help with the replacement is a great touch. I saved the kit after I was done and plan on using it for other things in the future. Nice bonus. - About 2-3 weeks in, the batteries seem to be working very well and have restored the right earbud to as it was from the factory. Time will tell how long they hold up, but I'm optimistic. Cons: - None regarding the batteries and kit that were part of this purchase. What to watch out for: - Don't apply too much heat to the earbud you want to disassemble. Turning the earbud in your fingers while applying heat from a heat gun or hair dryer should do the trick. Apply even heat for 10-15 seconds and see if you can pop the housing apart. - I used a paper towel for cushion, applied pressure via a pair of pliers with the paper towel under the teeth of the pliers, and the case started to separate perfectly. Please use very little force when attempting to separate the halves this way as too much pressure could damage the earbud or mar the plastic surface. - When working on the replacement, be careful not to damage any of the ribbon cables inside the earbud. - To separate the circuit board from the top of the battery, I applied heat very briefly, followed by a back-and-forth motion with the included guitar pick looking tool until the circuit board was free from the top of the battery. - Removing the battery can be a bit difficult as it has a type of glue that helps keep it secure. Try to work around the edges of the OEM battery to fee it from this glue. You could also apply heat in short intervals until it loosens as well. - Make sure you drop the new battery into the earbud with the correct polarity facing upwards. - Reassemble in the reverse and you should be good to go. Charge the earbud(s) and test things out. I was a victim of the bad batch of batteries that Sony put into their earlier production of the WF-1000XM4 earbuds. After about 2 years of occasional use, and a firmware update in mid to late 2024, my right earbud would never charge past 95% and when in use, the right earbud battery would maybe last 30 minutes. I was less than pleased after having spent a considerable amount on these earbuds about 2 years or so ago from the time this started happening. I lived with it, opting to use my over the ear headphones for my long flights and didn't think much of it, other than vowing to never give Sony another chance on earbuds, I love their over the ear noise cancelling headphones though. In searching for this issue, I found this battery kit and decided to give it a try. What's the worst that could happen, the right side works 0 minutes versus 30 minutes? I used a YouTube video for the disassembly, removal of OEM battery, installing the new battery, and reassembly. I used a Milwaukee heat gun, and the glue softened quickly but a hairdryer would work as well. Took about 5-10 minutes per earbud, I replaced both so they would both have new batteries, and so far, all is working very well.

### ⭐⭐⭐⭐⭐ Review
*by I***U on 16 October 2025*

I can attest that these are good enough for replacing a dying battery in your earbuds, they're a matched fit replacement. I use mine daily at work and after a year and a half of regular use they are no longer charging fully or lasting even 6 hours. But that's from charged to nearly dead... 5 days a week, for a year and a half. So they absolutly work, even if not as good as the original battery life. The tools are meh, get yourself a good razor blade or exacto knife, a thin strip of plastic (like from packaging) and patience, sliding it around the seam to break the adhesive on the buds and pop them apart, using the tweezers to lift and disconnect the ribbon cable from the two halves and be careful and patent pulling the old batteries out. The included adhesive is a joke. I've replaced both my own and my girlfriends earbuds and BOTH had the earbuds falling apart again with short term use. Pickup some super glue and apply just a TINY bit in a couple spots along the seam, spread it with a piece of plastic then push the halves together and use a piece of tape to HOLD them together for a few minutes while the glue cures. (Just make sure you connected that ribbon cable and checked to make sure the earbuds Work properly before you glue them together, and if you can, use a tiny bit of isopropyl and a tissue to clean the seam as earwax and grease will prevent the glue from bonding. Just don't spill or wipe the electronics inside with it or it will short out and kill the earbud! (best to clean it when old battery is removed before installing new battery) Overall, they're a good and cost effective way to prolong the life of your slightly dated but still very good quality earbuds to be able to keep using them longer, instead of needing to fork out a large sum of money for a replacement pair. I give them a 5 out of 5 even though they're fading a year and a half later because the original batteries only lasted 2 ish years before they started fading too with how regularly and often I use my earbuds. Just take your time doing this replacement, in a well lit area and if you got it, use a magnifying glass!

## Frequently Bought Together

- EXMUMCMR 2X Pack Z55H 3.85V 75mAh Battery Replacement for Sony WF1000XM4 WF-1000XM4 Industry Leading Noise Canceling Truly Wireless Earbud Headphones Battery+ Tools
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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-02-17*