How can I repair when MacBook does not work without charger?

I have diagnostic test on my macbook. Give me code PPT006 and Apple told me to

require battery repair service.

My macbook got milk damage and automatically shut down.

Thanks for the ifixit help, I was able to fix it and boot it up.

However, I don't know if there is problem with circuit(found a corrupted mole only on that spot) or the battery. Thank you