$5 Spy Pen
If you want to record meetings without someone knowing, you can pick up this $5 spy pen on Wish. The small pen records in 720P to a Micro SD card that you need to provide. The idea is that you stick this in a pocket with the lens showing and activate recording with a button on the top.
The pen includes a rechargeable battery, but there is no specific rating for the battery life. It accepts up to a 32 GB micro SD card and will record until full unless you stop recording with the button on top.
It's not James Bond style, but it might be just what you are looking for.