My battery needs service

My iPhone 7 got messed up after falling hard. I got an iCloud lock iPhone 7 and swapped the logic board. I turned the phone on and the phone wouldn’t stay powered on for 10min and kept restarting. I then pulled out the battery with 93% health from the old phone and put it in the new. Now, the old logic board is working with the old battery but when I checked the battery health, I was told to visit an authorized service personnel to help me. I need help on how to fix it because it has affected the phones performance.