Repaired from water damage, replaced battery, several issues.

Hey there, I recently recovered my phone from heavy water damage. Cleaned the whole inside with isopropyl, and had to replace my battery due to being saturated in water. I replaced it with BG920ABE (i believe i'll have to double check) which was abit different from my original battery model. So my phone worked for awhile pretty well, except my normal incall microphone was abit soft and my gyroscope and a few other sensors of the phone didn't work, (like gps navigation direction, heartbeat sensor, screen orientation). My current issue now is when i charge my phone with the original charger, its starting to have battery drain issues, it switches to a fast drain, then when i turn it on again it goes back to the ACTUAL battery percentage. Its as if its having trouble determining the battery life and as of right now the phones not turning on. I would like to know how i can repair the sensors and if i should replace my battery again with the actual model. Thanks!