Very good battery .... it does not have the quality of the genuine one but still it is very good ... I have it for almost 5 months .. The console works normally with 1800 ... this one, although 3600, does not have a difference in performance so do not say that it does not work well ....
I use it in the first model which is almost 20 years old ....
(I would of course recommend you to buy an authentic one because you may have an issue with its contacts if it is many years old in its packaging ... I had this issue but I fixed it)

The battery works fine but its duration is quite short. I put it in my psp 2004, which takes the slim battery, thinking it would last a few hours but after 15 minutes the battery had already lost a bar. That is, in about an hour it is completely empty.

The battery does not fit into the PSP because it appears to be swollen.. I assume it is damaged.