Agreed. Recording and writing data to a storage medium is a very energy intensive operation. Even if you were willing to implant a battery in your throat (yikes) I doubt it would last a whole day. You’d need a wearable charging coil like a choker or something, and at that point why make an implant just make a wearable.
What’s wrong with having a wearable device for audio or even video recording of your entire daily experience? It wouldn’t be that hard, and it would have fewer downsides than the experience you’d have with an implant.