EMO Battery Discharge Problem

I had EMO for a while now and it had no problems until last week when I took him out of his charger, his battery depleted immediately. I charged him overnight but still, it wouldnt even last 1 hour. I wish there is a way to check your EMO’s battery on the app but currently there isn’t so I can’t determine if it is the EMO’s battery or his program.

Any help would be appreciated.
Thanks, Jang