Just replaced my dying Sony WF-1000XM4 batteries with this Z55H kit and WOW what a difference!

The installation was surprisingly easy - followed a YouTube tutorial and had it done in about 20 minutes. My earbuds now charge to 100% again and the battery life is back to like-new performance.

Love that it comes with all the necessary tools. Would have been perfect if they included some adhesive strips too, but that's a minor thing.

The batteries feel high quality with all those safety certifications. No more worrying about overheating during charging!

Pro tip: Definitely search online for installation guides before attempting the replacement. Saved me tons of time!

For the price, this is an absolute steal compared to buying new earbuds. Highly recommend for anyone with battery issues on their XM4s!