The Osmo Pocket is a great camera, but my OP is now almost two years old and the battery isn't as good as it used to be. Is there any way to change the battery to make it good at new? At the very least, I hope that the Pocket 3 has a removable and changeable battery.

Hello there CuteOwl. Thank you for reaching out and I am sorry to know that you are having this issue with your DJI Osmo Pocket. As of the moment, we do not have any information with DJI's future products , specifications and with regards to this matter. Kindly please stay tuned to the latest updates by subscribing to DJI official website at www.dji.com or following us on social media ( Facebook: https://www.facebook.com/DJI , Twitter: https://twitter.com/djiglobal , YouTube: https://www.youtube.com/user/djiinnovations ). Thank you.

That did not exactly answer CuteOwl's question, and I'd like to know this too.

Which one of these options is closest to the truth with Osmo Pocket and Pocket 2:
a) There is some kind of way to change the battery by yourself;
b) The battery is non-user-replacable but it is possible to send the device to you to have a new battery in there; or
c) The battery cannot be removed and you can't get it changed by DJI - you need to buy a new device altogether?

I myself would also wish for a replaceable power source. I think having devices with non-replaceable batteries is unecological and artificially shortens the product's lifespan.

My Pocket 2's and it's wireless microphone's batteries are still fine, but it would be nice to know this forehand.

Battery replacement is listed as a DJI service item, and is not very expensive as I recall it.  Ease of getting it done probably depends on where you are in the world.

This is true and it is far from "ecology trend" . They already changed the bottom for P2. They could easily change it for the changeable battery. I hope this for the P3.