How big of a laser can I jam in a keychain laser pointer? (Patreon)

How big of a laser can I jam into a classic keychain laser pointer? I don't know the answer to this right now, but I will find out soon. I'm breaking out a bunch of different red laser diodes and funky batteries for this project, and may even have to resort to supercapacitors to maximize the output, even if it's just for short bursts.

I'm already pretty deep into filming this vid, so stay tuned! The project is pretty absurd, but it's still a great way to showcase cutting edge tech, as well as some unusual laser experiments.