Bose Headset Power Adaptor Question

[Veronica1965]

Hi,
I have a Bose Acoustic Noise Cancelling headset that's about ten years old. It has those half-ellipse batteries. The batteries are both dead or the unit is. I can charge them again and again and still it refuses to turn on. (I can upload photos if need be). My question is, is there any way I can rig this thing, like attaching the stripped wires of a power adaptor to the battery terminals? I'm not even sure what the watts, volts, and amperage are because the case doesn't have much info at all on it. Any help would be appreciated.