I have a couple of little cameras, old hat now I guess but they work and can be handy in various situations. I like to keep at least one in my camera bag just for incidentals. I have a little Canon IXUS 50, and an Olympus VR-350. Now, I know that my old Nikon D70 will take better pics. Heck my Pro iPhone will kill them all, especially with the Final Cut Camera app, and even more with the BlackMagic one, but sometimes point and shoot is enough, especially when my iPhone is doing drone duties.
So, batteries.. I have tried a few online sellers with mixed results. The Jungle Company have some from a brand called FUGASUN. Do we know if they're worth it? The Nikon needs new ones too. Budget is definitely important.