PSP 3001 Battery not detected

[GBAtemp]

Hello there!

I have a 3001 PSP with a problem: it does not detect any of my two batteries. In "battery source", it shows "External", however, both batteries seem to output a normal amount of voltage in their contacts.
I'm no technician and I don't really know much about electrical issues. Has my PSP itself gone bad? Can I repair it? Or are both my batteries busted?

Can someone help me?
Than you!

Edit: The batteries are knock-offs from a Brazilian brand named BMax (both of them, I think...

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Source: https://gbatemp.net/threads/psp-3001-ba ... ed.634268/