Possible water damage with a low budget

Hello everyone, I have a 3DS that I found about a month back, and today I decided to try to use it. I tried the power button with no luck, so I thought is was dead. I charged it up with my working charger that I use for my own 3DS, and the orange charging light turned on. Once it was fully charged, again I tried to turn it on with nothing happening. I opened the back up and took the battery out to see what I think was the water sticker white. Anything I can do to fix this? I only have some basic tools, experience with a soldering iron but no longer have one (lost it to a flooded basement), and no money to buy parts, but hopefully it can be fixed. If it turns out I can't fix it, could I use the parts to fix up my old 3DS? Many thanks!