Is battery draining fast covered under limited warranty for iphone 13 its been 9 months old
Hi bro, if there is a software issue, then you can check with apple service center once and they will do iOS Restore. clean installation of iOS. that will help fixing any such fast battery drain problem. it is covered under warranty.
Once warranty over, for diagnosis service center charges 1500 approximately. within warranty diagnosis and software support are free bro.