I found an eBay seller selling working batteries!

Yes, if you've come from /r/psp this will look familiar. I consider it one of my better contributions to the PSP community, so I figured I'd post it here as well.

I see a lot of posts about where to buy batteries online, and no one ever really seems to have a better answer than "try your luck with eBay." I didn't ever have a better answer, either. I've never had much luck with buying PSP batteries online. I didn't buy my first PSP until ~2013 or so, which was already too late to get OEM batteries. The first batteries I bought on eBay were all duds, and the batteries thrown in with another PSP I bought later were duds, too. I decided to try one more time, and this time I got lucky!

Link

Either this seller knows how to store batteries, or his supplier does. Both batteries arrived with ~40% charge, and neither were swelled. Both charge perfectly and were recognized the second I popped them into a PSP.

These particular batteries are 2000/3000 only, but I will say that because they're very, very slightly larger than OEM batteries (meaning they fit a tiny bit more snugly) I can use them in my 1000 even though they don't fill the entire battery compartment. That may just be a quirk of the two I received, though (a quirk I'm thankful for!).

So if you're ever in the market for a new PSP battery, consider giving this guy's batteries a shot. Maybe I just got lucky and the two I ordered were his only working batteries, but I can definitely say that I've had more luck with this seller's batteries than any other I've tried.