𝟮𝟬𝟮𝟲 𝗡𝗲𝘄 𝗨𝗽𝗴𝗿𝗮𝗱𝗲𝘀 Z55H Battery, Compatible with Sony Headset Battery for WF-1000XM4 • Truly Wireless Earbud Headphones Battery+ Tools [2PCS]

Like a lot of others, I ordered this kit to replace the damaged batteries caused by Sony with a faulty firmware update that ruined the originals. Before installing these new batteries, my earbuds would go from 100% charged to being dead in the span of about 15 minutes due to the firmware issue. Came with everything needed for a successful repair. Included the plastic spacer tools, a couple sets of tweezers that were not really suitable for the task, but I already had my own anyhow. Even had a set of finger gloves if you want to use them. Also came with a large tube of very good sealant that dispenses wonderfully and precisely. I compared the batteries to the originals and they are an exact match for specs. So far this kit has fixed my issue 100% and restored the original performance with surprising ease. I want to say it took me maybe 20 minutes to swap the batteries from start to finish with no real hiccups or issues along the way.

**Product Review: SONXIAVIVO 2024 New Upgrades Z55H Battery** The SONXIAVIVO 2024 New Upgrades Z55H Battery offers a seamless replacement experience for Sony WF-1000XM4 Truly Wireless Earbud Headphones. Here's what I found: **Positive Points:** - The package comes with useful tools for hassle-free battery replacement. - Thoughtful packaging ensures the components are well-protected. - The provided glue features a long, thin tip for precise application, aiding in clean placement. - Affordable pricing considering the quality and quantity of items included. - Battery replacements fit perfectly without any compatibility issues. - Batteries hold charge effectively, ensuring prolonged usage. - The product fulfills its intended purpose efficiently. - Accurate description matching the actual product. - Swift shipping and delivery ensure a prompt replacement process. **Areas for Improvement:** - If you already own pointed tweezers and electronic plastic tools, consider purchasing only the batteries. - The included tweezers lack a strong grip, which may be challenging when handling small cables during installation. **Overall Opinion:** The SONXIAVIVO 2024 New Upgrades Z55H Battery is a reliable solution for extending the lifespan of Sony WF-1000XM4 earbuds. With its user-friendly design and efficient performance, it's a recommended choice for those seeking affordable and high-quality battery replacements.

If you’re reading this, there’s a good chance you’re dealing with the known battery defect on the Sony WF-1000XM4 earbuds. I bought a used pair on eBay as an upgrade from my Pixel Buds A, but the battery life was awful—barely 10–12 minutes, wouldn’t charge past 50–60%, and the earbuds got so hot the case would blink red. After some research, I bought this battery replacement kit and I’m extremely satisfied. The kit completely revived what were essentially unusable earbuds and restored the battery life to its original expectancy—they honestly feel brand new again. I’m fairly tech-savvy and found the repair straightforward, though having an extra tool like a small clamp helped when opening the earbuds, and there are plenty of YouTube guides if needed. Overall, this kit absolutely saved my purchase and is well worth the money if you’re experiencing the same issue.

There is a lot of unnecessary stuff in the bag, especially if you already own some tweezers and prying tools, but the batteries are great. My earbuds are back to charging all the way and lasting as long as when they were new!

I have the WF1000XM5s. Candidly, I think they're a step down. The only issue is that my xm4s were experiencing the dreaded battery issue that has come to plague them. My understanding is that this stemmed from a bad firmware update some time ago that has since been corrected. Nonetheless, it destroyed the batteries. My left battery wouldn't charge above 60%, but worse is that it would die in 20 minutes. I was ready to toss these until I watched a few YouTube vids on replacing the battery. Some advice: Lots of the vids will show you fully taking apart the XM4s. No need to do this! Heat the shell of the earbuds lightly, then slowly pry it slighly open. From there, you can use the included flat pick (looks like a guitar pick) to separate the board from the battery. From there, carefully use the included screwdriver to lift the battery out. Put the new one in, press the board back down to the battery, and use the included glue to put a small bead around the bud. That's it! So much easier than the YouTube directions. I was able to do both buds in 15 minutes. Even better? The buds now charge to 100% and last as long as new!

All you need to get this job done. Blue prying tools( not the triangles) the plastics are on the soft side so be aware to not pry to hard. Patience is key for this fix. This tool set is great. The glue is perfect d/t its fine tip. Will update battery quality and value of money.

Used this battery and tool set to replace my Sony XM4 earbud batteries. Before the replacement, the batteries would only last about 1.5 hours max, using noise cancelling - we’ll see how long they last after the replacement. The replacement was fairly easy. I heated the earbuds to melt the factory glue by placing them inside a plastic baggie, and submerging that in a hot mug of water for about 10 minutes. Waiting long enough to let the glue loosen up was the hardest part. After that, used the razor blade to gently start prying apart the two halves - I could only get them open AFTER I went all the way around once. Seems as though the razor was also cutting through some of the glue, which helped immensely. After that, and because of the long heating process, it was super easy to peel the motherboards off the battery (attached with adhesive) and remove it. On my Sony XM4s, there was enough room in the wiring that I didn’t need to unclip any connectors. Placed in the new battery, and they worked! The glue that comes with the set has the perfect tip on it to place just the right amount of glue around the edge before resealing the 2 halves. Once done, I found I needed to rubber band the two halves together while the glue dried to more of the seamless look they started with. You can see in the pictures the seam after the glue has dried. Not perfect, but not super noticeable if you’re more than a foot away from them. If I had taken more time working my way around the entire earbud with the razor, I think the seam wouldn’t look this wide - so user error here. Very happy with this kit! Skill level: Tech Nerd; Engineer Time needed: 45 minutes total Other items needed: paper towels, rubber bands/tape

Overall it was a very complete kit with picks, pry tools, 3 small screw drivers, a razor blade and some finger sleeves. If you already have tools, these tools will seem very flimsy and probably won't last. I ended up not using any of the tools but the small tube of glue has a needle point tip for precisely applying a small bead of glue around the whole seam of each ear bud without making a mess. You will have enough glue left for probably another 20 earbuds. Lastly there was come discoloration on one of the batteries but tested within spec with a multimeter. It was worth it for just the two batteries and the tube of glue. The only thing missing was a heat gun but you can't expect that at this price point. My earbuds have the same capacity as when they were new but only time will tell if they last. I will update if they fail prematurely.

Muy buenas baterías.