I've been having bad luck for years with rechargeable batteries which keep dying or don't hold charge for longer than a few minutes, or the charger for them stops working, and it's gotten to the point where I've spent 4 times more money on the batteries and chargers than the camera's own price. So I want to try something new − using 5v USB portable battery packs instead of the 2 AA rechargeable batteries. The camera has a plug hole for a wall socket 3v adapter (label on the bottom of the camera says 3.15v⎓) but that is not a mobile solution. But this hole can be used more easily than the AA battery contacts behind their protective cover.
I have basic soldering skills, but not enough knowledge about electronic components to figure out for myself what to use to make a circuit to do what I want. If you can post a complete noob-friendly answer, that's be wonderful. If you can point me at some starting places, that'd be great too.
An important thing to know about the expected power output of the circuit: apparently, standard non-rechargeable batteries will never work with a photo camera, as it will say "replace batteries" with any brand new pair fresh from the store. They don't seem to support enough output to power the camera's lens motor.