LIR1254 Replacement 3.85V 70mAh 0.29Wh Z55H Battery Compatible with WF1000XM4 WF-1000XM4 WF-SP900 Headphones,S/M/L 3 Sizes 3 Pairs Soft Memory Foam Ear Tips Earbuds Foam Tips+Tools

Item received earlt and found better then described... Good packaging,

Excelente

Buenas baterías, pensé que iban a ser malas pero a casi seis meses de uso siguen funcionando bien los audífonos y la batería dura bastante

The batteries included in this kit are exactly what you want for the Sony WF1000XM4 earbuds. Mine were dying after about 2 years of heavy use. Just a few months ago they still went for over 2 hours, and then suddenly one of the earbuds lasted only 25 minutes. I did my research and found this kit to replace the batteries. Online video shows in detail how to do this. You really need a heat gun and some sort of clamp to do the job, plus, I found the included tweezers and the razor blade in this kit are of marginal utility for the job. I used the tweezers to flip a little cable lock up, but everything else I did with metal tweezers (search Amazon - lots of great tools for electronics repair are available. You will use them again and again). To open the earbuds, you remove the foam tips, hold the buds in tweezers or a clamp, and heat them up gently with a blow dryer or heat gun. You only need a little heat to get the glue plyable. Test it frequently while heating to get the feel for the temps, because you don't want to damage the audio driver. I used a clamp to press on the case and once the glue got soft, it started to split apart. Then you can use the included razor blade, or just a plastic tool meant for case separating to pry it open. Once open, you need to open a small cable latch, for which I used the included tweezers. The cable then needs to be pulled out, but for that I needed a different tool. The plastic tweezers just had no gripping power there. Once that cable came off, you pry apart a pair of circuit boards, again using a plastic tool, not a razor blade. Then the glue holding the lower circuit board to the battery needs a little warmup before you peel it away. You want the glue to stay on the board to put it back on the new battery. The old battery is then pried out of the case with a pointy tool. A bit of glue and the magnets below were holding mine in place but it wasn't difficult to lever it out. The batteries are IDENTICAL to those included in this kit. ZeniPower Z55H 3.85V. That alone is worth the price of admission here. All other batteries I saw during a search are unbranded or cost the same as this entire kit. Insert new battery, writing pointing up, press circuit board back on so that the glue holds it there, press connectors back together, insert the tiny ribbon cable as deep as you can get it, then flip the tiny lock lever down. Now grab the included glue, which is perfect for this job (and worth another $10 compared to buying it separately). But before you glue, put the still open buds into the charging case and remove them to test if they still work. Mine fired right up, both channels, so I proceeded with the glue job. A few drops, smeared along the small edgen then press together and keep it in a clamp overnight. On the next day remove the excess glue with a scraper tool. You are now good to go a couple of more years before these incredible headphones will need another battery transplant. Up next for me is a battery transplant in the charging case. I am sure it is getting close to end of life as well. Get a magnifying glass if your eyesight isn't great. This battery swap job is not for people who have zero DIY experience, but it isn't difficult if you can deal with tiny and fragile things.

Tiene más herramientas de lo que necesitabas para remplazar las baterías pero.bueno en general