𝟮𝟬𝟮𝟲 𝗡𝗲𝘄 𝗨𝗽𝗴𝗿𝗮𝗱𝗲𝘀 𝐙𝟓𝟓𝐇 𝐁𝐚𝐭𝐭𝐞𝐫𝐲,Compatible with Sony Headset Battery for WF-1000XM4(𝟐𝐏𝐂𝐒)+with Installation Tools Kit Z55H

Cannot attest to the quality of the batteries, but the screwdriver that came in the set is made of the worst quality metal out there. It just crumbles without unscrewing the screws in the earbuds

Very nice packaging with all necessary tools and even more than necessary tools lol. Will update this review after a year using these batteries

Breathed new life into my long dead XM4 earbuds. Cells appear to be genuine Zenni Power cells. Despite careful work, I did break a small cable (90° cable not sandwich cable) and there doesn't appear to be any impact on use and functions. Sure it does something but touch, anc/passthrough, so on all works fine so who knows. I am ecstatic to have be beloved buds back.

Two useful batteries with a bag full of useless cheap "tools" just to make the price up.

These arrived quick. Easy enough to install and after charging my earbuds (wf-1000xm4) they appear to be holding charge well again. I replaced both left and right earbud batteries as I had time, and wanted to test longevity with the new replacements. Before, the right earbud would lose charge, go from 100% to 0% in an hour or less. It would also heat up in the charging case, and overall caused the case to drain quicker as well. Opening the earbuds was easy with a heat gun and spudgers. Replacing the battery took little finesse but still easily done. I did a quick test to the earbuds with a small charge before glueing. Just to be sure no other components were damaged. I let the glue cute for a full 24 hours while the earbuds were in foamed clamps to prevent damage/scratches. So far after about an hour and a half of use these new batteries went from 100% charged to 93%. Great improvement from before. I will continue this review as time passes. 9 months in and still going strong. Keep that tube of glue. I will have to re apply. The seams on my wf-1000xm4 are starting to be able to pull apart. (my fault there. i was cleaning the seam and didn't realize i was scraping glue out)

Lors de mon remplacement de batterie, y'a juste une batterie qui fonctionne. Pour être sur j'ai mis l'ancienne batterie dans l'écouteur et c'est fonctionnel. Avec un multimètre, le niveau de batterie est dans la zone de sa mort. Donc j'ai juste une batterie de vivante....