I bought these for my Sony MDR 6000 headphones, they were too small and didn't fit. I went to a battery store in town and they told me I would buy two regular ni-hm aaa or ni-hm aa batteries for my headphones. I was surprised. I bought 2 regular nickel metal hydride batteries and they were fine. Sonia wanted $50 for it. I got four batteries for $10. They wrap the batteries in a plastic holder but they are either AA or AAA. Just buy the equivalent with the same chemistry and description and you'll be fine.
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