I've kept this for a long time, and it's probably an accessory for a video camera. I'm sorry, I don't know anything about it, so I'm listing it. It's unused. There's a number written on it: JT91005. ※See the 4th photo. The following is what I found out using AI. Please purchase with the understanding that: ↓ ↓ The contents are not batteries, but an adapter to supply power to the camera from an AC adapter via a cable.