Apple Watch Series 9 Battery Healthy but Suddenly Draining rapidly.

My watch recently started draining rapidly even though battery health is at 89%. I went out for a walk last Monday while the watch was operating normally but I had forgot to charge it the night before. During the walk the battery powered off. When I went charge it it took hours for it to come back on and I was starting to worry it was dead dead. Ever since then the battery drops to low power several times a day and even dies after about 6.5-7 hours while in bed sleeping. I have completely erased and unpaired the watch and started fresh as if a new watch and still dying rapidly. Is this something a new battery would fix or could it be something else? Also seems to drain at the same rate under lower power mode as well but haven't really measured it.