Review on High-Capacity 2 Pack Replacement Battery for Sony BP-HP550-11 Headphones (700mAh, 2.4V, Ni-MH) by Evelyn Cacsire

They work great with my Sony headphones. It didn't look exactly like the photo but they had the same part number and specs and still worked fine. - see photo. I ran into this battery issue after two months of use. The battery starts to work much less than before. I used a second battery - same thing, they last about two hours, then it starts to turn off. I used my regular battery and it lasted twice as long at around four hours. These batteries should last about 7 hours. Maybe I got a bad batch. I will try another brand.