Used to not hold a charge so changed battery but not powering up now

@robertadams313 Yes, looks like a bit of corrosion, etc. you do want to completely disassemble your controller. Then remove the board and clean all of it with a high grade (+90%) isopropyl alcohol. Use something like this guide Reparación de los daños en un iPhone debido a la entrada de líquidos for the cleaning. It was written for an iPhone but all the points made, are pertinent to your controller as well. Check for burned, missing or otherwise "odd" looking components. Once everything is properly cleaned give it another try. Water damage is the hardest to repair since virtually any part can fail.