battery connection problem

I was replacing my ESC board two days ago, and after everything was fixed and I connected my battery there was a sudden spark and a smell of something burnt. I checked my battery and it was as it is shown in the picture. It turned out that the XT160 cable had its + - sides with the wrong...

I recently had a big crash with my blackout racing drone. The power wire from the battery to the distribution board ripped out the silver connecter plate. I need to solder the wires back on. How can I replace that silver plate on the board? Thanks