/vr/ - Retro Games

So I recently bought a used copy of Metroid: Zero Mission from a local used games store. When I started it up everything worked fine except I the save would be erased when I turned the game boy off. I looked into it and saw that Zero Mission uses an internal battery so I looked up some tutorials, removed the old battery and put a brand new one in. I tried it without soldering using tape and pressure and it didn't fix the issue. As a final solution I tried soldering it still to no avail. I managed to not break the game, but saving still doesn't work. What should I do? The picture is the bottom of the battery after soldering it. I took pictures of the top after I finished that if you need to see them. And I already checked to make sure the poles are aligned correctly.