2PCS Z55H Battery, [75mAh](𝟮𝟬𝟮𝟰 𝗡𝗲𝘄 𝗨𝗽𝗴𝗿𝗮𝗱𝗲𝘀) Compatible with Sony Headset Battery for WF-1000XM4 • Truly Wireless Earbud Headphones Battery+ Tools

it was easy to use to fix an iphone s8 plus

This product page clearly advertises a pair of 3.85V, 75mAh (0.29Wh) batteries, sold as part of a kit intended for repairing Sony WF-1000XM4 headphones. Accurate battery specifications are critical for this repair, as the headphones and their companion app rely on specific battery parameters for proper functionality.However, the batteries I received were rated at only 70mAh. This discrepancy affects both the battery life—reduced by approximately 7%—and the accuracy of the charge level reported by the app, which from my understanding expects a 75mAh battery.It is unacceptable to advertise precise specifications and then deliver a product that does not meet them.‐-‐------------------------------------------EDIT POST REPAIR:I have now carried out the repair on my headphones, and ended up using these batteries despite my concerns above.Battery life is much better, and the app does seem to report battery life accurately despite the concerns I voiced above.To test the batteries, I listened to 2 hours of music with AAC codec, DSEE Extreme off, noise cancelling on. the headphones used 22% of their battery in this time. The specifications from Sony state that they should last up to 8 hours under these conditions on a whole charge, so I feel these batteries are within normal limits for a new headset.I still think it is unacceptable to advertise technical specifications and not deliver them, but ultimately this product has done the job adequately that I am happy to revise this review.

The tools is bad quality and doesnt include the glue. But the battery works.

All tools included and the battery lasts longer than standard the iPhone battery

My battery life extended and last for whole day while playing games

not a good product claims it lasts longer than the original battery but it doesn't its worse

Good value for money, does what it says on the tin

Absolutely shocking and wouldn’t buy again