BP-HP550-11 Cordless Phone Battery 2.4 Volt, Ni-MH 700mAh - Replacement For SONY MDR-RF810/840/850/860/925/970/4000

Its hard to get excited about a battery but it works as expected and the price was very reasonable and quality appears very good. I was about to toss my headphones until I realized it was a battery issue and replacing it seem to have fixed the noise problem.

The battery worked fine at first and I was very pleased. After a short period the headset started picking up static of the kind experienced before implying that the battery is running down (aging). I charge the unit everyday for approximately 16+ hours, yet the headset is generating the level of static it did when the previous batteries were dying.Please send me a new, fresh replacement battery.

My headphones got to where, after a week of charging, would last for about 10 minutes before starting to snap, crackle and pop off. With this new battery, they seem to work for 8-12 hours before recharging. I wish I had done this a lot sooner.

I needed a new battery for my Sony headset and i found in the listings several batteries that were not Sony but would work. After searching the listing I found a battery that was listed as a Sony battery and the picture was an exact picture of my battery. I ordered the battery but when it came it was not a sony battery and did not match the picture. It was some cheap replacement battery made in china. I think this was false advertising, advertising one product and supplying a different battery than was advertised. They said I could return it but I had already opened it, so now I am stuck with a cheap replacement battery that probably will only last about half as long as the Sony battery.

Good vendor response to order. Arrived on time. Quality appears up to good standards. Price competitive with all others. Would buy again.

I was pleased with this replacement battery although it don't have SONY written on the side of it ,it works well in their products including their wireless headphones. It charges just like the OEM, I have no complaints and am very pleased with the performance.

I have been using a couple of Sony wireless headphones for several years so after repeated recharging over this period of the original batteries started to require more frequent charging.These replacement batteries more or less eliminated he recharging issue.

Great !

Whenever anything lives up to my expectations, I am very glad that I purchased it. So far, this does. Any problem would be its lifetime which I will only be able to judge sometime in the future.

Needed a new battery for my Sony wireless headphones. This one was a perfect fit and works great. Much, much cheaper than one from Sony....

Came fully charged and works fine. Used it for about a month or two

I used this to replace rechargeable Sony headphones. A long time to charge and they work.

Not much to say on a product like this ... battery works great. My wireless headphones go for hours now rather than just over an hour on the old battery. Happy.