Mickey: Soldered Battery to a Gameboy Advance Game PCB so it can save, it still does not...

So i bought "one of those carts" from Ebay and it does not want to save. In the game when i try to save it tries multiple times and says the battery has run dry. I opened it up and i did not see a battery to replace so i figured i will install one. I got a CR1616 and i soldered it correctly. Tried to save and yet again it does not want to save. Is there anything else i have to do to the PCB? Bridge something? Cut some line? Maybe someone can help me out here.

There is this guy on youtube...

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