Cracked screen on iPhone
I've cracked the screen on my iPhone and have yet to have it replaced. All of a sudden my battery only lasts a few hours before it dies - does a cracked screen affect battery capacity?
iPhone SE (2nd generation)
I am guessing it could, particularly if there is a short circuit involved. I would advise you to just turn it off until you can get it repaired.
Read this document about 'iPhone Repair - Screen Damage' [and links to other iPhone repair services]. Click here --> iPhone Screen Repair & Replacement - Apple Support