Hello Applegrl2021,
Thank you for posting in the Apple Support Communities. We're sorry to see that you're experiencing unexpected battery drain, and we're here for you.
First, when you deleted the app, did you delete the Home app itself by taking the steps below? We ask to be sure of the steps you've taken. Keep in mind that deleting the Home app will also delete locally-stored data.
Remove apps from iPhone
If you've deleted Home, then try restarting your device and giving it 24 hours since deleting it. These steps can help clear any residual cache.
Restart your iPhone
From there, we suggest taking these additional steps to help maximize battery life:
Maximizing Battery Life and Lifespan
For additional info about iPhone performance as it relates to its battery, we welcome you to review this Apple Support article:
iPhone Battery and Performance
We hope this information is useful. Kind regards.